{"type": "FeatureCollection", "features": [{"id": "10.3390/ma14092302", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:21:53Z", "type": "Journal Article", "created": "2021-04-29", "title": "2D Dynamic Directional Amplification (DDA) in Phononic Metamaterials", "description": "<?xml version='1.0' encoding='UTF-8'?><article><p>Phononic structures with unit cells exhibiting Bragg scattering and local resonance present unique wave propagation properties at wavelengths well below the regime corresponding to bandgap generation based on spatial periodicity. However, both mechanisms show certain constraints in designing systems with wide bandgaps in the low-frequency range. To face the main practical challenges encountered in such cases, including heavy oscillating masses, a simple dynamic directional amplification (DDA) mechanism is proposed as the base of the phononic lattice. This amplifier is designed to present the same mass and use the same damping element as a reference two-dimensional (2D) phononic metamaterial. Thus, no increase in the structure mass or the viscous damping is needed. The proposed DDA can be realized by imposing kinematic constraints to the structure\u2019s degrees of freedom (DoF), improving inertia and damping on the desired direction of motion. Analysis of the 2D lattice via Bloch\u2019s theory is performed, and the corresponding dispersion relations are derived. The numerical results of an indicative case study show significant improvements and advantages over a conventional phononic structure, such as broader bandgaps and increased damping ratio. Finally, a conceptual design indicates the usage of the concept in potential applications, such as mechanical filters, sound and vibration isolators, and acoustic waveguides.</p></article>", "keywords": ["phononic", "metamaterials", "damping", "13. Climate action", "0103 physical sciences", "02 engineering and technology", "0210 nano-technology", "7. Clean energy", "01 natural sciences", "dynamic directional amplifier", "Article"]}, "links": [{"href": "http://www.mdpi.com/1996-1944/14/9/2302/pdf"}, {"href": "https://www.mdpi.com/1996-1944/14/9/2302/pdf"}, {"href": "https://doi.org/10.3390/ma14092302"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Materials", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.3390/ma14092302", "name": "item", "description": "10.3390/ma14092302", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.3390/ma14092302"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-04-29T00:00:00Z"}}, {"id": "11585/941074", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:14Z", "type": "Journal Article", "created": "2023-06-03", "title": "A multiple scattering formulation to design meta-trenches for mitigating low-frequency ground-borne vibrations induced by surface railways and subways", "description": "We propose a multiple scattering formulation to investigate the performance of meta-trenches. The meta-trench is a novel device, composed of an array of resonant units buried in the ground in a proper arrangement, aimed at reducing the railway and/or subway induced ground motion by exploiting its scattering and resonant properties. Compared to classical open trenches, the resonators contribute to improving the wave mitigation performance of the trench in the low-frequency regime.The proposed formulation allows to consider the wave source anywhere in the half-space and a generic distribution of resonators in terms of number and position. The incident wave field generated by the source, such as a train or subway, along with the scattered wave fields produced by the resonant units that constitute the meta-trench, are modeled via Green's functions. The multiple scattering formulation enables the solution of coupled wave problems by determining the amplitudes of scattered wave fields at various frequencies. Through comparison with finite element simulations, we demonstrate that in both buried source (i.e., subway) and surface-located source (i.e., ground railway) scenarios, our analytical formulation is able to properly model the dynamics of the coupled problems with a noticeable computational cost saving. Opening to fast and reliable parametric simulations, our formulation allows for a deeper knowledge of the wave interaction processes, resulting thus in a reliable tool for predicting the coupled wave field under both bulk and Rayleigh waves.", "keywords": ["Buried-source problem", "Elastic waves", "Meta-trench", "Elastic metamaterials; Meta-trench; Buried-source problem; Railway; subway induced vibrations; Elastic waves", "02 engineering and technology", "0210 nano-technology", "Elastic metamaterials", "Railway/subway induced vibrations", "0201 civil engineering"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/941074/3/A%20multiple%20scattering%20formulation%20to%20design%20meta-trenches%20for%20mitigating%20low-frequency%20ground-borne%20vibrations%20induced%20by%20surface%20railways%20and%20subways.pdf"}, {"href": "https://doi.org/11585/941074"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20Sound%20and%20Vibration", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "11585/941074", "name": "item", "description": "11585/941074", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/11585/941074"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-10-01T00:00:00Z"}}, {"id": "10.1002/adfm.202215105", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:14:25Z", "type": "Journal Article", "created": "2023-04-24", "title": "Modular Design for Versatile Broadband Polarizing Metasurfaces with Freely Switching Functions", "description": "Abstract<p>Polarization is a fundamental property of electromagnetic waves that plays a key role in many physical phenomena and applications. Schemes to manipulate it are revisited with the emergence of metasurfaces, which have brought multi\uffe2\uff80\uff90functionalities straightforwardly. However, this has come at the expense of design complexity that relies strongly on field theory. Here, an ingenious strategy of modular design is proposed to construct subwavelength multifunctional polarization control devices. Chiral metasurfaces with different handedness are first proposed and regarded as modules. The versatile polarization controller can thus be obtained with the combination of different modules. These experiments demonstrate that the well\uffe2\uff80\uff90designed polarization controller possesses reconfigurable functionality, and various broadband polarization and amplitude regulation functions with high efficiency including arbitrary linear polarization rotation, asymmetric transmission effect, neutral\uffe2\uff80\uff90density\uffe2\uff80\uff90like filter, polarization beam splitter, etc., can be readily realized just by changing the cascaded modules. The physical mechanisms of the versatile polarization controller and chiral metasurface modules are both guaranteed by the Fabry\uffe2\uff80\uff93P\uffc3\uffa9rot\uffe2\uff80\uff90like resonances, which are theoretically verified via the transfer matrix method. It is envisioned that the modular concept will be of great benefit to designing compact multifunctional polarization controllers.</p", "keywords": ["Technology", "POLARIZATION", "Chemistry", " Multidisciplinary", "Materials Science", "Materials Science", " Multidisciplinary", "Condensed Matter", "02 engineering and technology", "versatile polarization controller", "530", "chiral metasurfaces", "01 natural sciences", "09 Engineering", "Physics", " Applied", "modular designs", "METAMATERIALS", "0103 physical sciences", "Physical", "Nanoscience & Nanotechnology", "Materials", "Multidisciplinary", "Science & Technology", "02 Physical Sciences", "Chemistry", " Physical", "Physics", "Fabry-Perot-like resonance", "620", "Chemistry", "LIGHT", "Physics", " Condensed Matter", "Applied", "Physical Sciences", "Science & Technology - Other Topics", "broadband", "03 Chemical Sciences", "0210 nano-technology"]}, "links": [{"href": "https://onlinelibrary.wiley.com/doi/pdf/10.1002/adfm.202215105"}, {"href": "https://doi.org/10.1002/adfm.202215105"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Advanced%20Functional%20Materials", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1002/adfm.202215105", "name": "item", "description": "10.1002/adfm.202215105", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1002/adfm.202215105"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-04-23T00:00:00Z"}}, {"id": "10.1002/admi.202200998", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:14:25Z", "type": "Journal Article", "created": "2022-08-19", "title": "Mechanically\u2010Reconfigurable Edge States in an Ultrathin Valley\u2010Hall Topological Metamaterial", "description": "Abstract<p>Broadband topological metamaterials hold the key for designing the next generation of integrated photonic platforms and microwave devices given their protected back\uffe2\uff80\uff90scattering\uffe2\uff80\uff90free and unidirectional edge states, among other exotic properties. However, synthesizing such metamaterial has proven challenging. Here, a broadband bandgap (relative bandwidth of more than 43%) Valley\uffe2\uff80\uff90Hall topological metamaterial with deep subwavelength thickness is proposed. The present topological metamaterial is composed of three layers printed circuit boards whose total thickness is 1.524\uffc2\uffa0mm \uffe2\uff89\uff88 \uffce\uffbb/100. The topological phase transition is achieved by introducing an asymmetry parameter \uffce\uffb4r. Three mechanically reconfigurable edge states can be obtained by varying interlayer displacement. Their robust transmission is demonstrated through two kinds of waveguide domain walls with cavities and disorders. Exploiting the proposed topological metamaterial, a six\uffe2\uff80\uff90way power divider is constructed and measured as a proof\uffe2\uff80\uff90of\uffe2\uff80\uff90concept of the potential of the proposed technology for future electromagnetic devices.</p", "keywords": ["topological phase transition", "0306 Physical Chemistry (incl. Structural)", "0301 basic medicine", "Technology", "0303 health sciences", "Multidisciplinary", "Science & Technology", "robust transmission of waveguide", "Chemistry", " Multidisciplinary", "Materials Science", "topological metamaterials", "Materials Science", " Multidisciplinary", "530", "7. Clean energy", "620", "Chemistry", "03 medical and health sciences", "edge state", "Physical Sciences", "0912 Materials Engineering", "reconfigurable topological edge states"]}, "links": [{"href": "https://onlinelibrary.wiley.com/doi/pdf/10.1002/admi.202200998"}, {"href": "https://doi.org/10.1002/admi.202200998"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Advanced%20Materials%20Interfaces", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1002/admi.202200998", "name": "item", "description": "10.1002/admi.202200998", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1002/admi.202200998"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-08-18T00:00:00Z"}}, {"id": "10.1016/j.eml.2021.101564", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:16:33Z", "type": "Journal Article", "created": "2021-12-08", "title": "Cloaking strategy for Love waves", "description": "Love waves are antiplane elastic waves which propagate along the surface of a heterogeneous medium. Under time-harmonic regime, they are governed by a scalar equation of the Helmholtz type. We exploit the invariance of this governing equation under an in-plane arbitrary coordinate transformation to design broadband cloaks for surface defects. In particular, we apply transformation elastodynamics to determine the anisotropic, position dependent, mechanical properties of ideal cloaks able to hide triangular and parabolic-shaped defects. Dispersion analysis and time-harmonic numerical simulations are employed to validate the proposed strategy. Next, we utilize layered monoclinic materials, with homogenized properties matching those of ideal cloaks, to design feasible cloaks. The performance of the layered cloaks is validated via time-harmonic numerical simulations which show a significant reduction of the defect-generated scattered fields.", "keywords": ["Love waves; Cloaking; Transformation elastodynamics; Layered media; Homogenization; Metamaterials", "0103 physical sciences", "FOS: Physical sciences", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "01 natural sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.eml.2021.101564"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Extreme%20Mechanics%20Letters", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.eml.2021.101564", "name": "item", "description": "10.1016/j.eml.2021.101564", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.eml.2021.101564"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-01-01T00:00:00Z"}}, {"id": "10.1016/j.ijengsci.2021.103547", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:16:59Z", "type": "Journal Article", "created": "2021-08-10", "title": "Lamb\u2019s problem for a half-space coupled to a generic distribution of oscillators at the surface", "description": "We propose an analytical framework to model the effect of single and multiple mechanical surface oscillators on the dynamics of vertically polarized elastic waves propagating in a semi-infinite medium. The formulation extends the canonical Lamb's problem, originally developed to obtain the wavefield induced by a harmonic line source in an elastic half-space, to the scenario where a finite cluster of vertical oscillators is attached to the medium surface. In short, our approach utilizes the solution of the classical Lamb's problem as Green's function to formulate the multiple scattered fields generated by the resonators. For an arbitrary number of resonators, arranged atop the elastic half-space in an arbitrary configuration, the displacement fields are obtained in closed-form and validated with numerics developed in a two-dimensional finite element environment.", "keywords": ["FOS: Physical sciences", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "02 engineering and technology", "0101 mathematics", "0210 nano-technology", "Elastic waves; Lamb\u2019s problem; Seismic metamaterials; Metasurfaces", "01 natural sciences"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/830573/4/Lambs_problems_pp.pdf"}, {"href": "https://doi.org/10.1016/j.ijengsci.2021.103547"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/International%20Journal%20of%20Engineering%20Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.ijengsci.2021.103547", "name": "item", "description": "10.1016/j.ijengsci.2021.103547", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.ijengsci.2021.103547"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-11-01T00:00:00Z"}}, {"id": "10.1016/j.ijengsci.2020.103347", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:16:59Z", "type": "Journal Article", "created": "2020-07-12", "title": "Seismic metasurfaces on porous layered media: Surface resonators and fluid-solid interaction effects on the propagation of Rayleigh waves", "description": "Abstract   Seismic surface wave mitigation using metamaterials is a growing research field propelled by intrinsic theoretical value and possible application prospects. Up to date, the complexity of site conditions found in engineering practice, which can include layered stratigraphy and variable water table level, has been discarded in the development of analytical frameworks to favor the derivation of simple, yet effective, closed-form dispersion laws. This work provides a further step towards the analytical study of \u201cseismic metasurfaces\u201d in real site conditions considering the propagation of Rayleigh waves through a layered porous substrate equipped with local resonators. To this aim, we combine classical elasticity theory, Biot\u2019s poroelasticity and an effective medium approach to describe the metasurface dynamics and its coupling with the poroelastic substrate. The developed framework naturally includes simpler configurations like seismic metasurfaces atop homogeneous dry or saturated soils. Apart from known phenomena like wave-resonance hybridization and surface wave band gaps, we predict the existence of an extended frequency range where surface waves are attenuated due to energy leakage in the form of slow pressure waves, as a result of the fluid-solid interaction. Besides, we demonstrate that the surface wave band gap and the related surface-to-shear wave conversion is robust to variations in the water table level. Conversely, when the dry and saturated layers have different material parameters, for example, due to different porosity ratios, the surface-to-shear wave conversion can be accompanied by the excitation of higher-order surface modes, which remain channeled below the metasurface. These analytical findings, augmented and confirmed by numerical simulations, evidence the importance of accounting for fluid-solid interaction in the dynamics of seismic metasurfaces.", "keywords": ["13. Climate action", "02 engineering and technology", "0210 nano-technology", "MetamaterialsRayleigh wavesBiot's theoryFluid-solid interactionBand gaps", "Band gaps; Biot's theory; Fluid-solid interaction; Metamaterials; Rayleigh waves", "0201 civil engineering"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/785171/3/Seismic%20metasurfaces%20on%20porous%20layered%20media.pdf"}, {"href": "https://doi.org/10.1016/j.ijengsci.2020.103347"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/International%20Journal%20of%20Engineering%20Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.ijengsci.2020.103347", "name": "item", "description": "10.1016/j.ijengsci.2020.103347", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.ijengsci.2020.103347"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-09-01T00:00:00Z"}}, {"id": "10.1016/j.ijengsci.2023.103899", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:16:59Z", "type": "Journal Article", "created": "2023-06-09", "title": "Cloaking Rayleigh waves via symmetrized elastic tensors", "description": "In this work we propose a strategy based on coordinate transformation to cloak Rayleigh waves. Rayleigh waves are in-plane elastic waves which propagate along the free surface of semi-infinite media. They are governed by Navier equations that retain their form for an in-plane arbitrary coordinate transformation x=\u039e(X), upon choosing the specific kinematic relation U(\u039e(X))=u(x) between displacement fields in virtual, i.e. reference, (U) and transformed, i.e. cloaked, (u) domains. However, the elasticity tensor of the transformed domain is no longer fully symmetric, and thus, it is difficult to design with common materials. Motivated by this issue, we propose a symmetrization technique, based on the arithmetic mean, to obtain anisotropic, yet symmetric, elastic tensors for Rayleigh wave near-cloaking. In particular, by means of time-harmonic numerical simulations and dispersion analyses, we compare the efficiency of triangular and semi-circular cloaks designed with the original non-symmetric tensors and the related symmetrized versions. In addition, different coordinate transformations, e.g. linear, quadratic and cubic, are adopted for the semi-circular cloaks. Through the analyses, we show that a symmetrized semi-circular cloak, obtained upon the use of a quadratic transformation, performs better than the other investigated designs. Our study provides a step towards the design of feasible and efficient broadband elastic metamaterial cloaks for surface waves.", "keywords": ["0103 physical sciences", "Cloaking; Metamaterials; Rayleigh waves; Symmetrization; Transformation elastodynamics", "01 natural sciences", "[PHYS] Physics [physics]"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/940480/3/1-s2.0-S0020722523000903-main.pdf"}, {"href": "https://doi.org/10.1016/j.ijengsci.2023.103899"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/International%20Journal%20of%20Engineering%20Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.ijengsci.2023.103899", "name": "item", "description": "10.1016/j.ijengsci.2023.103899", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.ijengsci.2023.103899"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-10-01T00:00:00Z"}}, {"id": "10.1016/j.jsv.2021.116599", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:17:09Z", "type": "Journal Article", "created": "2021-11-11", "title": "Rayleigh wave propagation in nonlinear metasurfaces", "description": "We investigate the propagation of Rayleigh waves in a half-space coupled to a nonlinear metasurface. The metasurface consists of an array of nonlinear oscillators attached to the free surface of a homogeneous substrate. We describe, analytically and numerically, the effects of nonlinear interaction force and energy loss on the dispersion of Rayleigh waves. We develop closed-form expressions to predict the dispersive characteristics of nonlinear Rayleigh waves by adopting a leading-order effective medium description. In particular, we demonstrate how hardening nonlinearity reduces and eventually eliminates the linear filtering bandwidth of the metasurface. Softening nonlinearity, in contrast, induces lower and broader spectral gaps for weak to moderate strengths of nonlinearity, and narrows and eventually closes the gaps at high strengths of nonlinearity. We also observe the emergence of a spatial gap (in wavenumber) in the in-phase branch of the dispersion curves for softening nonlinearity. Finally, we investigate the interplay between nonlinearity and energy loss and discuss their combined effects on the dispersive properties of the metasurface. Our analytical results, supported by finite element simulations, demonstrate the mechanisms for achieving tunable dispersion characteristics in nonlinear metasurfaces.", "keywords": ["Nonlinear metasurfaces", "0203 mechanical engineering", "FOS: Physical sciences", "Damped waves propagation", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "02 engineering and technology", "Nonlinear dispersion", "Damped waves propagation; Elastic metamaterials; Nonlinear dispersion; Nonlinear metasurfaces; Rayleigh waves", "Rayleigh waves", "0210 nano-technology", "Elastic metamaterials"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/844088/6/Rayleigh%20wave%20propagation%20in%20nonlinear%20metasurfaces.pdf"}, {"href": "https://authors.library.caltech.edu/110071/3/1-s2.0-S0022460X2100612X-main.pdf"}, {"href": "https://authors.library.caltech.edu/110071/1/2107.06930.pdf"}, {"href": "https://doi.org/10.1016/j.jsv.2021.116599"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20Sound%20and%20Vibration", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.jsv.2021.116599", "name": "item", "description": "10.1016/j.jsv.2021.116599", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.jsv.2021.116599"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-03-01T00:00:00Z"}}, {"id": "10.1016/j.jsv.2023.117845", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:17:09Z", "type": "Journal Article", "created": "2023-06-03", "title": "A multiple scattering formulation to design meta-trenches for mitigating low-frequency ground-borne vibrations induced by surface railways and subways", "description": "We propose a multiple scattering formulation to investigate the performance of meta-trenches. The meta-trench is a novel device, composed of an array of resonant units buried in the ground in a proper arrangement, aimed at reducing the railway and/or subway induced ground motion by exploiting its scattering and resonant properties. Compared to classical open trenches, the resonators contribute to improving the wave mitigation performance of the trench in the low-frequency regime.The proposed formulation allows to consider the wave source anywhere in the half-space and a generic distribution of resonators in terms of number and position. The incident wave field generated by the source, such as a train or subway, along with the scattered wave fields produced by the resonant units that constitute the meta-trench, are modeled via Green's functions. The multiple scattering formulation enables the solution of coupled wave problems by determining the amplitudes of scattered wave fields at various frequencies. Through comparison with finite element simulations, we demonstrate that in both buried source (i.e., subway) and surface-located source (i.e., ground railway) scenarios, our analytical formulation is able to properly model the dynamics of the coupled problems with a noticeable computational cost saving. Opening to fast and reliable parametric simulations, our formulation allows for a deeper knowledge of the wave interaction processes, resulting thus in a reliable tool for predicting the coupled wave field under both bulk and Rayleigh waves.", "keywords": ["Buried-source problem", "Elastic waves", "Meta-trench", "Elastic metamaterials; Meta-trench; Buried-source problem; Railway; subway induced vibrations; Elastic waves", "02 engineering and technology", "0210 nano-technology", "Elastic metamaterials", "Railway/subway induced vibrations", "0201 civil engineering"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/941074/3/A%20multiple%20scattering%20formulation%20to%20design%20meta-trenches%20for%20mitigating%20low-frequency%20ground-borne%20vibrations%20induced%20by%20surface%20railways%20and%20subways.pdf"}, {"href": "https://doi.org/10.1016/j.jsv.2023.117845"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20Sound%20and%20Vibration", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.jsv.2023.117845", "name": "item", "description": "10.1016/j.jsv.2023.117845", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.jsv.2023.117845"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-10-01T00:00:00Z"}}, {"id": "10.1016/j.soildyn.2022.107366", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:17:37Z", "type": "Journal Article", "created": "2022-08-09", "title": "Seismic resonant metamaterials for the protection of an elastic-plastic SDOF system against vertically propagating seismic shear waves (SH) in nonlinear soil", "description": "Open AccessISSN:1879-341X", "keywords": ["Seismic risk mitigation method", "Seismic metamaterials", "0211 other engineering and technologies", "02 engineering and technology", "Seismic risk mitigation method; Seismic metamaterials; Metabarrier; Multi-mass resonators; meta-SSI; Domain reduction method (DRM); Nonlinear soil; Nonlinear structure; Energy-based approach (APEDR); Real-ESSI Simulator", "meta-SSI", "0201 civil engineering", "Domain reduction method (DRM)", "Nonlinear soil", "Energy-based approach (APEDR)", "Metabarrier", "Multi-mass resonators", "Nonlinear structure", "Real-ESSI Simulator"]}, "links": [{"href": "https://doi.org/10.1016/j.soildyn.2022.107366"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Dynamics%20and%20Earthquake%20Engineering", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.soildyn.2022.107366", "name": "item", "description": "10.1016/j.soildyn.2022.107366", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soildyn.2022.107366"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-03-01T00:00:00Z"}}, {"id": "10.1016/j.soildyn.2024.108631", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:17:37Z", "type": "Journal Article", "created": "2024-04-24", "title": "Dynamic structure-soil-structure interaction for nuclear power plants", "description": "Open AccessThe paper explores the linear and nonlinear dynamic interaction between the reactor and the auxiliary buildings of a Nuclear Power Plant on a realistic layered soil profile, aiming to evaluate the effect of the auxiliary building on the seismic response of crucial components inside the reactor building. Based on realistic geometrical assumptions, highfidelity 3D finite element (FE) models of increasing sophistication are created in the Real-ESSI Simulator. Starting with elastic soil conditions and assuming tied soil\u2500foundation interfaces, it is shown that the rocking vibration mode of the soil\u2500reactor building system is amplified by the presence of the auxiliary building through a detrimental out-of-phase rotational interaction mechanism. Adding nonlinear interfaces, which allow for soil\u2500foundation detachment during seismic shaking, introduces higher excitation frequencies (above 10 Hz) in the foundation of the reactor building, leading to amplification effects in the resonant vibration response of the biological shield wall (incl. reactor vessel) inside the reactor building. A small amount of sliding at the soil\u2500foundation interface of the auxiliary building slightly decreases its response, thus reducing its aforementioned negative effects on the reactor building. When soil nonlinearity is accounted for, the rocking vibration mode of the soil\u2500reactor building system almost vanishes, thanks to the strongly nonlinear response of the underlying soil. This leads to a beneficial out-of-phase horizontal interaction mechanism between the two buildings, reducing the spectral accelerations at critical points inside the reactor building by up to 55% for frequencies close to the resonant vibration frequency of the auxiliary building. This implies that the neighboring buildings could offer mutual seismic protection to each other, in a similar way to the recently emerged seismic resonant metamaterials, provided that they are properly tuned during the design phase, accounting for soil and soil-foundation interface nonlinearities.", "keywords": ["Structure-Soil-Structure interaction (SSSI)", "Structure-Soil-Structure interaction (SSSI); Nuclear Power Plants (NPPs); Domain reduction method (DRM); Nonlinear interface; Nonlinear soil; Seismic resonant metamaterials; Meta-SSI", "FOS: Physical sciences", "Structure-soil-structure interaction (SSSI); Nuclear power plants (NPPs); Domain reduction method (DRM); Nonlinear interface; Nonlinear soil; Seismic resonant metamaterials; Meta-SSI", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "7. Clean energy", "Domain reduction method (DRM)", "Meta-SSI", "Nuclear Power Plants (NPPs)", "Nonlinear soil", "Structure-soil-structure interaction (SSSI)", "Nuclear power plants (NPPs)", "Nonlinear interface", "Seismic resonant metamaterials"]}, "links": [{"href": "https://doi.org/10.1016/j.soildyn.2024.108631"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Dynamics%20and%20Earthquake%20Engineering", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.soildyn.2024.108631", "name": "item", "description": "10.1016/j.soildyn.2024.108631", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soildyn.2024.108631"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2024-06-01T00:00:00Z"}}, {"id": "10.1016/j.ymssp.2022.109478", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:17:53Z", "type": "Journal Article", "created": "2022-07-01", "title": "Topological edge states of quasiperiodic elastic metasurfaces", "description": "In this work, we investigate the dynamic behavior and the topological properties of quasiperiodic elastic metasurfaces, namely arrays of mechanical oscillators arranged over the free surface of an elastic half-space according to a quasiperiodic spatial distribution. An ad-hoc multiple scattering formulation is developed to describe the dynamic interaction between Rayleigh waves and a generic array of surface resonators. The approach allows to calculate the spectrum of natural frequencies of the quasiperiodic metasurface which reveals a fractal distribution of the frequency gaps reminiscent of the Hofstadter butterfly. These gaps have nontrivial topological properties and can host Rayleigh-like edge modes. We demonstrate that such topologically protected edge modes can be driven from one boundary to the opposite of the array by a smooth variation of the phason, a parameter which modulates the geometry of the array. Topological elastic waveguides designed on these principles provide new opportunities in surface acoustic wave engineering for vibration control, energy harvesting, and lossless signal transport, among others.", "keywords": ["Quasiperiodic structures; Rayleigh waves; Synthetic dimensions; Topological metamaterials; Edge modes", "0103 physical sciences", "FOS: Physical sciences", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "01 natural sciences"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/897192/3/topological%2bedge%2bpost%2bprint%2b.pdf"}, {"href": "https://doi.org/10.1016/j.ymssp.2022.109478"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Mechanical%20Systems%20and%20Signal%20Processing", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.ymssp.2022.109478", "name": "item", "description": "10.1016/j.ymssp.2022.109478", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.ymssp.2022.109478"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-12-01T00:00:00Z"}}, {"id": "10.1109/metamaterials54993.2022.9920804", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:19:14Z", "type": "Journal Article", "created": "2022-11-04", "title": "Cloaking for surface elastic waves", "keywords": ["0103 physical sciences", "02 engineering and technology", "Seismic wave; metamaterials; vibration mitigation", "0210 nano-technology", "01 natural sciences"]}, "links": [{"href": "https://doi.org/10.1109/metamaterials54993.2022.9920804"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/2022%20Sixteenth%20International%20Congress%20on%20Artificial%20Materials%20for%20Novel%20Wave%20Phenomena%20%28Metamaterials%29", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1109/metamaterials54993.2022.9920804", "name": "item", "description": "10.1109/metamaterials54993.2022.9920804", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1109/metamaterials54993.2022.9920804"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-09-12T00:00:00Z"}}, {"id": "10.1098/rspa.2021.0669", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:19:07Z", "type": "Journal Article", "created": "2022-06-01", "title": "A multiple scattering formulation for finite-size flexural metasurfaces", "description": "<?xml version='1.0' encoding='UTF-8'?><article><p>We provide an analytical formulation to model the propagation of elastic waves in a homogeneous half-space supporting an array of thin plates. The technique provides the displacement field obtained from the interaction between an incident wave generated by a harmonic source and the scattered fields induced by the flexural motion of the plates. The scattered field generated by each plate is calculated using an ad-hoc set of Green\u2019s functions. The interaction between the incident field and the scattered fields is modelled through a multiple scattering formulation. Owing to the introduction of the multiple scattering formalism, the proposed technique can handle a generic set of plates arbitrarily arranged on the half-space surface. The method is validated via comparison with finite element simulations considering Rayleigh waves interacting with a single and a collection of thin plates. Our framework can be used to investigate the interaction of vertically polarized surface waves and flexural resonators in different engineering contexts, from the design of novel surface acoustic wave devices to the interpretation of urban vibration problems.</p></article>", "keywords": ["elastic metamaterials; Rayleigh waves; Lamb's problem; seismic metasurfaces; structure-soil-structure interactions", "0103 physical sciences", "FOS: Physical sciences", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "02 engineering and technology", "0210 nano-technology", "01 natural sciences"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/897228/3/A_multiple_scattering_formulation_for_flexural_metasurfaces__PRSA_.pdf"}, {"href": "https://royalsocietypublishing.org/doi/pdf/10.1098/rspa.2021.0669"}, {"href": "https://doi.org/10.1098/rspa.2021.0669"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Proceedings%20of%20the%20Royal%20Society%20A%3A%20Mathematical%2C%20Physical%20and%20Engineering%20Sciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1098/rspa.2021.0669", "name": "item", "description": "10.1098/rspa.2021.0669", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1098/rspa.2021.0669"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-06-01T00:00:00Z"}}, {"id": "10.1098/rsta.2022.0021", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:19:07Z", "type": "Journal Article", "created": "2022-07-18", "title": "Buckling versus unilateral constraint for a multistable metamaterial element", "description": "<?xml version='1.0' encoding='UTF-8'?><article><p>A structural element is designed and investigated, forming the basis for the development of an elastic multistable metamaterial. The leitmotif of the structural design is the implementation of a strut characterized by a bifurcation occurring at either vanishing tensile or compressive load. It is shown that buckling at null load leads to a mechanical equivalence with a unilateral constraint formulation, introducing shocks in dynamics. Towards a future analysis of the latter, the nonlinear quasi-static response is investigated, showing the multistable character of the structure, which may appear as bistable or tetrastable.</p>           <p>This article is part of the theme issue \u2018Wave generation and transmission in multi-scale complex media and structured metamaterials (part 1)\u2019.</p></article>", "keywords": ["0301 basic medicine", "03 medical and health sciences", "metamaterials", "buckling; metamaterials; nonlinear motion; unilateral constraint; vibration control", "vibration control", "Classical Physics (physics.class-ph)", "FOS: Physical sciences", "buckling", "unilateral constraint", "Physics - Classical Physics", "02 engineering and technology", "0210 nano-technology", "nonlinear motion"]}, "links": [{"href": "https://iris.unitn.it/bitstream/11572/356728/1/RSTA20220021.pdf"}, {"href": "https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2022.0021"}, {"href": "https://doi.org/10.1098/rsta.2022.0021"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Philosophical%20Transactions%20of%20the%20Royal%20Society%20A%3A%20Mathematical%2C%20Physical%20and%20Engineering%20Sciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1098/rsta.2022.0021", "name": "item", "description": "10.1098/rsta.2022.0021", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1098/rsta.2022.0021"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-07-18T00:00:00Z"}}, {"id": "10.1109/metamaterials54993.2022.9920867", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:19:14Z", "type": "Journal Article", "created": "2022-11-04", "title": "Analytical modeling of finite-size elastic metasurfaces: a multiple scattering formulation", "keywords": ["seixmic waves; metamaterials; vibration mitigation;", "02 engineering and technology", "0101 mathematics", "0210 nano-technology", "01 natural sciences"]}, "links": [{"href": "https://doi.org/10.1109/metamaterials54993.2022.9920867"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/2022%20Sixteenth%20International%20Congress%20on%20Artificial%20Materials%20for%20Novel%20Wave%20Phenomena%20%28Metamaterials%29", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1109/metamaterials54993.2022.9920867", "name": "item", "description": "10.1109/metamaterials54993.2022.9920867", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1109/metamaterials54993.2022.9920867"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-09-12T00:00:00Z"}}, {"id": "10.1103/physrevapplied.17.054023", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:19:11Z", "type": "Journal Article", "created": "2022-05-13", "title": "Computational Verification and Experimental Validation of the Vibration-Attenuation Properties of a Geometrically Nonlinear Metamaterial Design", "description": "Closed AccessPhysical Review Applied, 17 (5)", "keywords": ["1-dimensional systems", "Acoustic metamaterials", "Nonlinear acoustics", "Numerical techniques", "0103 physical sciences", "Earthquakes", "Bragg structures", "Phononic crystals", "02 engineering and technology", "Acoustic techniques", "0210 nano-technology", "01 natural sciences"]}, "links": [{"href": "https://doi.org/10.1103/physrevapplied.17.054023"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Physical%20Review%20Applied", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1103/physrevapplied.17.054023", "name": "item", "description": "10.1103/physrevapplied.17.054023", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1103/physrevapplied.17.054023"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-05-13T00:00:00Z"}}, {"id": "10.1103/physrevlett.123.033901", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:19:11Z", "type": "Journal Article", "created": "2019-07-15", "title": "Spontaneous Emission and Resonant Scattering in Transition from Type I to Type II Photonic Weyl Systems", "description": "Spontaneous emission and scattering behavior of an emitter or a resonant scatterer strongly depend on the density of states of the surrounding medium. It has been shown that the resonant scattering cross section (RSC) may diverge at the Weyl frequency of a type I Weyl system due to the diminishing density of states. Here we study the spontaneous emission (SE) and RSC in a photonic metacrystal across the critical transition between type I and type IIWeyl systems. Theoretical results show that the SE rate of an emitter in a type I Weyl system diminishes to zero at the Weyl frequency. When the system is tuned towards the transition point between type I and type II Weyl point, the dip in the SE spectrum at the Weyl frequency becomes infinitely sharp. The dip vanishes at the critical transition, and transforms into a peak when the system changes into a type II Weyl system. We further show that the resonant scattering cross section also exhibits dramatically different spectral features across the transition. Our study demonstrates the ability to tune SE and RSC through altering the dispersion of the Weyl medium between type I and type II, which provides a fundamentally new route in manipulating light-matter interactions.", "keywords": ["0103 physical sciences", "metamaterials; topological", "01 natural sciences"]}, "links": [{"href": "https://doi.org/10.1103/physrevlett.123.033901"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Physical%20Review%20Letters", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1103/physrevlett.123.033901", "name": "item", "description": "10.1103/physrevlett.123.033901", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1103/physrevlett.123.033901"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-07-15T00:00:00Z"}}, {"id": "10.1103/physrevx.9.011040", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:19:11Z", "type": "Journal Article", "created": "2019-02-28", "title": "Willis Metamaterial on a Structured Beam", "description": "Open Access21 pages, 3 figures", "keywords": ["[PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics]", "[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]", "[PHYS.PHYS]Physics [physics]/Physics [physics]", "Physics", "QC1-999", "FOS: Physical sciences", "Acoustics", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "530", "01 natural sciences", "Metamaterials", "0103 physical sciences", "[PHYS.PHYS] Physics [physics]/Physics [physics]"]}, "links": [{"href": "https://doi.org/10.1103/physrevx.9.011040"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Physical%20Review%20X", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1103/physrevx.9.011040", "name": "item", "description": "10.1103/physrevx.9.011040", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1103/physrevx.9.011040"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-02-28T00:00:00Z"}}, {"id": "10.1515/nanoph-2021-0803", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:20:21Z", "type": "Journal Article", "created": "2022-04-11", "title": "Recent progress in terahertz metamaterial modulators", "description": "Abstract                <p>The terahertz (0.1\uffe2\uff80\uff9310\uffc2\uffa0THz) range represents a fast-evolving research and industrial field. The great interest for this portion of the electromagnetic spectrum, which lies between the photonics and the electronics ranges, stems from the unique and disruptive sectors where this radiation finds applications in, such as spectroscopy, quantum electronics, sensing and wireless communications beyond 5G. Engineering the propagation of terahertz light has always proved to be an intrinsically difficult task and for a long time it has been the bottleneck hindering the full exploitation of the terahertz spectrum. Amongst the different approaches that have been proposed so far for terahertz signal manipulation, the implementation of metamaterials has proved to be the most successful one, owing to the relative ease of realisation, high efficiency and spectral versatility. In this review, we present the latest developments in terahertz modulators based on metamaterials, while highlighting a few selected key applications in sensing, wireless communications and quantum electronics, which have particularly benefitted from these developments.</p", "keywords": ["Technology", "PEROVSKITE", "SYMMETRY", "QC1-999", "Materials Science", "0205 Optical Physics", "Materials Science", " Multidisciplinary", "DEVICE", "Review", "02 engineering and technology", "ULTRAFAST", "530", "7. Clean energy", "Physics", " Applied", "terahertz", "SWITCH", "modulators", "Nanoscience & Nanotechnology", "Multidisciplinary", "Science & Technology", "1007 Nanotechnology", "Physics", "Optics", "620", "0906 Electrical and Electronic Engineering", "metamaterials", "Applied", "Physical Sciences", "Science & Technology - Other Topics", "ABSORBER", "0210 nano-technology", "METASURFACE"]}, "links": [{"href": "https://www.degruyter.com/document/doi/10.1515/nanoph-2021-0803/pdf"}, {"href": "https://doi.org/10.1515/nanoph-2021-0803"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Nanophotonics", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1515/nanoph-2021-0803", "name": "item", "description": "10.1515/nanoph-2021-0803", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1515/nanoph-2021-0803"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-03-02T00:00:00Z"}}, {"id": "10.3929/ethz-b-000549998", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:22:11Z", "type": "Journal Article", "created": "2022-05-13", "title": "Computational Verification and Experimental Validation of the Vibration-Attenuation Properties of a Geometrically Nonlinear Metamaterial Design", "description": "Closed AccessPhysical Review Applied, 17 (5)", "keywords": ["1-dimensional systems", "Acoustic metamaterials", "Nonlinear acoustics", "Numerical techniques", "0103 physical sciences", "Earthquakes", "Bragg structures", "Phononic crystals", "02 engineering and technology", "Acoustic techniques", "0210 nano-technology", "01 natural sciences"]}, "links": [{"href": "https://doi.org/10.3929/ethz-b-000549998"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Physical%20Review%20Applied", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.3929/ethz-b-000549998", "name": "item", "description": "10.3929/ethz-b-000549998", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.3929/ethz-b-000549998"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-05-13T00:00:00Z"}}, {"id": "10.3929/ethz-b-000592388", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:22:11Z", "type": "Report", "title": "Seismic Protection of a Reinforced Concrete Moment-Frame Building using Resonant Metamaterials: Finite Element Model Verification", "description": "Open AccessProceedings of the Third European Conference on Earthquake Engineering and Seismology \u2013 3ECEES", "keywords": ["Seismic Metamaterials", "Seismic Protection Devices", "Meta-SSI", "Domain Reduction Method (DRM)", "Metabarrier", "Real-ESSI Simulator", "Seismic Metamaterials; Seismic Protection Devices; Metabarrier; Meta-SSI; Domain Reduction Method (DRM); Real-ESSI Simulator"], "contacts": [{"organization": "Kanellopoulos, Constantinos; id_orcid0000-0002-5637-6088, Yang, Han, Jeremi\u0107, Boris, Anastasopoulos, Ioannis, Stojadinovic, Bozidar; id_orcid0000-0002-1713-1977,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.3929/ethz-b-000592388"}, {"rel": "self", "type": "application/geo+json", "title": "10.3929/ethz-b-000592388", "name": "item", "description": "10.3929/ethz-b-000592388", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.3929/ethz-b-000592388"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-01-01T00:00:00Z"}}, {"id": "3158564463", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:27:32Z", "type": "Journal Article", "created": "2021-04-29", "title": "2D Dynamic Directional Amplification (DDA) in Phononic Metamaterials", "description": "<?xml version='1.0' encoding='UTF-8'?><article><p>Phononic structures with unit cells exhibiting Bragg scattering and local resonance present unique wave propagation properties at wavelengths well below the regime corresponding to bandgap generation based on spatial periodicity. However, both mechanisms show certain constraints in designing systems with wide bandgaps in the low-frequency range. To face the main practical challenges encountered in such cases, including heavy oscillating masses, a simple dynamic directional amplification (DDA) mechanism is proposed as the base of the phononic lattice. This amplifier is designed to present the same mass and use the same damping element as a reference two-dimensional (2D) phononic metamaterial. Thus, no increase in the structure mass or the viscous damping is needed. The proposed DDA can be realized by imposing kinematic constraints to the structure\u2019s degrees of freedom (DoF), improving inertia and damping on the desired direction of motion. Analysis of the 2D lattice via Bloch\u2019s theory is performed, and the corresponding dispersion relations are derived. The numerical results of an indicative case study show significant improvements and advantages over a conventional phononic structure, such as broader bandgaps and increased damping ratio. Finally, a conceptual design indicates the usage of the concept in potential applications, such as mechanical filters, sound and vibration isolators, and acoustic waveguides.</p></article>", "keywords": ["phononic", "metamaterials", "damping", "13. Climate action", "0103 physical sciences", "02 engineering and technology", "0210 nano-technology", "01 natural sciences", "7. Clean energy", "dynamic directional amplifier", "Article"]}, "links": [{"href": "http://www.mdpi.com/1996-1944/14/9/2302/pdf"}, {"href": "https://www.mdpi.com/1996-1944/14/9/2302/pdf"}, {"href": "https://doi.org/3158564463"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Materials", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "3158564463", "name": "item", "description": "3158564463", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/3158564463"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-04-29T00:00:00Z"}}, {"id": "2815712844", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:27:07Z", "type": "Journal Article", "created": "2019-02-28", "title": "Willis Metamaterial on a Structured Beam", "description": "Open Access21 pages, 3 figures", "keywords": ["[PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics]", "[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]", "[PHYS.PHYS]Physics [physics]/Physics [physics]", "Physics", "QC1-999", "FOS: Physical sciences", "Acoustics", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "530", "01 natural sciences", "Metamaterials", "0103 physical sciences", "[PHYS.PHYS] Physics [physics]/Physics [physics]"]}, "links": [{"href": "https://doi.org/2815712844"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Physical%20Review%20X", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "2815712844", "name": "item", "description": "2815712844", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/2815712844"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-02-28T00:00:00Z"}}, {"id": "20.500.11850/670813", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:40Z", "type": "Journal Article", "created": "2024-04-24", "title": "Dynamic structure-soil-structure interaction for nuclear power plants", "description": "Open AccessThe paper explores the linear and nonlinear dynamic interaction between the reactor and the auxiliary buildings of a Nuclear Power Plant on a realistic layered soil profile, aiming to evaluate the effect of the auxiliary building on the seismic response of crucial components inside the reactor building. Based on realistic geometrical assumptions, highfidelity 3D finite element (FE) models of increasing sophistication are created in the Real-ESSI Simulator. Starting with elastic soil conditions and assuming tied soil\u2500foundation interfaces, it is shown that the rocking vibration mode of the soil\u2500reactor building system is amplified by the presence of the auxiliary building through a detrimental out-of-phase rotational interaction mechanism. Adding nonlinear interfaces, which allow for soil\u2500foundation detachment during seismic shaking, introduces higher excitation frequencies (above 10 Hz) in the foundation of the reactor building, leading to amplification effects in the resonant vibration response of the biological shield wall (incl. reactor vessel) inside the reactor building. A small amount of sliding at the soil\u2500foundation interface of the auxiliary building slightly decreases its response, thus reducing its aforementioned negative effects on the reactor building. When soil nonlinearity is accounted for, the rocking vibration mode of the soil\u2500reactor building system almost vanishes, thanks to the strongly nonlinear response of the underlying soil. This leads to a beneficial out-of-phase horizontal interaction mechanism between the two buildings, reducing the spectral accelerations at critical points inside the reactor building by up to 55% for frequencies close to the resonant vibration frequency of the auxiliary building. This implies that the neighboring buildings could offer mutual seismic protection to each other, in a similar way to the recently emerged seismic resonant metamaterials, provided that they are properly tuned during the design phase, accounting for soil and soil-foundation interface nonlinearities.", "keywords": ["Structure-Soil-Structure interaction (SSSI)", "Structure-Soil-Structure interaction (SSSI); Nuclear Power Plants (NPPs); Domain reduction method (DRM); Nonlinear interface; Nonlinear soil; Seismic resonant metamaterials; Meta-SSI", "FOS: Physical sciences", "Structure-soil-structure interaction (SSSI); Nuclear power plants (NPPs); Domain reduction method (DRM); Nonlinear interface; Nonlinear soil; Seismic resonant metamaterials; Meta-SSI", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "7. Clean energy", "Domain reduction method (DRM)", "Meta-SSI", "Nuclear Power Plants (NPPs)", "Nonlinear soil", "Structure-soil-structure interaction (SSSI)", "Nuclear power plants (NPPs)", "Nonlinear interface", "Seismic resonant metamaterials"]}, "links": [{"href": "https://doi.org/20.500.11850/670813"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Dynamics%20and%20Earthquake%20Engineering", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "20.500.11850/670813", "name": "item", "description": "20.500.11850/670813", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/20.500.11850/670813"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2024-06-01T00:00:00Z"}}, {"id": "11585/918853", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:14Z", "type": "Journal Article", "created": "2022-11-04", "title": "Cloaking for surface elastic waves", "keywords": ["0103 physical sciences", "02 engineering and technology", "Seismic wave; metamaterials; vibration mitigation", "0210 nano-technology", "01 natural sciences"]}, "links": [{"href": "https://doi.org/11585/918853"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/2022%20Sixteenth%20International%20Congress%20on%20Artificial%20Materials%20for%20Novel%20Wave%20Phenomena%20%28Metamaterials%29", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "11585/918853", "name": "item", "description": "11585/918853", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/11585/918853"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-09-12T00:00:00Z"}}, {"id": "10.7712/120123.10452.20430", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:25:36Z", "type": "Journal Article", "created": "2023-10-27", "title": "EXPERIMENTAL STUDY OF PHONONIC STRUCTURES WITH DDA ENHANCED UNIT-CELLS", "description": "Open AccessISSN:2623-3347", "keywords": ["Phononic structures", "Experiment", "Vibration control", "Amplification mechanism", "Metamaterials", "Phononic structures; Metamaterials; Amplification mechanism; Experiment; Vibration control"], "contacts": [{"organization": "Kalderon, Moris, Mantakas, Antonios, Chondrogiannis, Kyriakos Alexandros; id_orcid0000-0003-3771-7040, Antoniadis, Ioannis A.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.7712/120123.10452.20430"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Proceedings%20of%20the%208th%20International%20Conference%20on%20Computational%20Methods%20in%20Structural%20Dynamics%20and%20Earthquake%20Engineering%20%28COMPDYN%202015%29", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.7712/120123.10452.20430", "name": "item", "description": "10.7712/120123.10452.20430", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.7712/120123.10452.20430"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-01-01T00:00:00Z"}}, {"id": "10044/1/107846", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:25:41Z", "type": "Journal Article", "created": "2023-04-23", "title": "Modular Design for Versatile Broadband Polarizing Metasurfaces with Freely Switching Functions", "description": "Abstract                   <p>Polarization is a fundamental property of electromagnetic waves that plays a key role in many physical phenomena and applications. Schemes to manipulate it are revisited with the emergence of metasurfaces, which have brought multi\uffe2\uff80\uff90functionalities straightforwardly. However, this has come at the expense of design complexity that relies strongly on field theory. Here, an ingenious strategy of modular design is proposed to construct subwavelength multifunctional polarization control devices. Chiral metasurfaces with different handedness are first proposed and regarded as modules. The versatile polarization controller can thus be obtained with the combination of different modules. These experiments demonstrate that the well\uffe2\uff80\uff90designed polarization controller possesses reconfigurable functionality, and various broadband polarization and amplitude regulation functions with high efficiency including arbitrary linear polarization rotation, asymmetric transmission effect, neutral\uffe2\uff80\uff90density\uffe2\uff80\uff90like filter, polarization beam splitter, etc., can be readily realized just by changing the cascaded modules. The physical mechanisms of the versatile polarization controller and chiral metasurface modules are both guaranteed by the Fabry\uffe2\uff80\uff93P\uffc3\uffa9rot\uffe2\uff80\uff90like resonances, which are theoretically verified via the transfer matrix method. It is envisioned that the modular concept will be of great benefit to designing compact multifunctional polarization controllers.</p", "keywords": ["Technology", "POLARIZATION", "Chemistry", " Multidisciplinary", "Materials Science", "Materials Science", " Multidisciplinary", "Condensed Matter", "02 engineering and technology", "versatile polarization controller", "530", "chiral metasurfaces", "01 natural sciences", "09 Engineering", "Physics", " Applied", "modular designs", "METAMATERIALS", "0103 physical sciences", "Physical", "Nanoscience & Nanotechnology", "Materials", "Multidisciplinary", "Science & Technology", "02 Physical Sciences", "Chemistry", " Physical", "Physics", "Fabry-Perot-like resonance", "620", "Chemistry", "LIGHT", "Physics", " Condensed Matter", "Applied", "Physical Sciences", "Science & Technology - Other Topics", "broadband", "03 Chemical Sciences", "0210 nano-technology"]}, "links": [{"href": "https://onlinelibrary.wiley.com/doi/pdf/10.1002/adfm.202215105"}, {"href": "https://doi.org/10044/1/107846"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Advanced%20Functional%20Materials", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10044/1/107846", "name": "item", "description": "10044/1/107846", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10044/1/107846"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-04-23T00:00:00Z"}}, {"id": "10044/1/96649", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:25:41Z", "type": "Journal Article", "created": "2022-04-11", "title": "Recent progress in terahertz metamaterial modulators", "description": "Abstract                <p>The terahertz (0.1\uffe2\uff80\uff9310\uffc2\uffa0THz) range represents a fast-evolving research and industrial field. The great interest for this portion of the electromagnetic spectrum, which lies between the photonics and the electronics ranges, stems from the unique and disruptive sectors where this radiation finds applications in, such as spectroscopy, quantum electronics, sensing and wireless communications beyond 5G. Engineering the propagation of terahertz light has always proved to be an intrinsically difficult task and for a long time it has been the bottleneck hindering the full exploitation of the terahertz spectrum. Amongst the different approaches that have been proposed so far for terahertz signal manipulation, the implementation of metamaterials has proved to be the most successful one, owing to the relative ease of realisation, high efficiency and spectral versatility. In this review, we present the latest developments in terahertz modulators based on metamaterials, while highlighting a few selected key applications in sensing, wireless communications and quantum electronics, which have particularly benefitted from these developments.</p", "keywords": ["Technology", "PEROVSKITE", "SYMMETRY", "QC1-999", "Materials Science", "0205 Optical Physics", "Materials Science", " Multidisciplinary", "DEVICE", "Review", "02 engineering and technology", "ULTRAFAST", "530", "7. Clean energy", "Physics", " Applied", "terahertz", "SWITCH", "modulators", "Nanoscience & Nanotechnology", "Multidisciplinary", "Science & Technology", "1007 Nanotechnology", "Physics", "Optics", "620", "0906 Electrical and Electronic Engineering", "metamaterials", "Applied", "Physical Sciences", "Science & Technology - Other Topics", "ABSORBER", "0210 nano-technology", "METASURFACE"]}, "links": [{"href": "https://www.degruyter.com/document/doi/10.1515/nanoph-2021-0803/pdf"}, {"href": "https://doi.org/10044/1/96649"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Nanophotonics", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10044/1/96649", "name": "item", "description": "10044/1/96649", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10044/1/96649"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-03-02T00:00:00Z"}}, {"id": "10044/1/99354", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:25:41Z", "type": "Journal Article", "created": "2022-08-18", "title": "Mechanically\u2010Reconfigurable Edge States in an Ultrathin Valley\u2010Hall Topological Metamaterial", "description": "Abstract<p>Broadband topological metamaterials hold the key for designing the next generation of integrated photonic platforms and microwave devices given their protected back\uffe2\uff80\uff90scattering\uffe2\uff80\uff90free and unidirectional edge states, among other exotic properties. However, synthesizing such metamaterial has proven challenging. Here, a broadband bandgap (relative bandwidth of more than 43%) Valley\uffe2\uff80\uff90Hall topological metamaterial with deep subwavelength thickness is proposed. The present topological metamaterial is composed of three layers printed circuit boards whose total thickness is 1.524\uffc2\uffa0mm \uffe2\uff89\uff88 \uffce\uffbb/100. The topological phase transition is achieved by introducing an asymmetry parameter \uffce\uffb4r. Three mechanically reconfigurable edge states can be obtained by varying interlayer displacement. Their robust transmission is demonstrated through two kinds of waveguide domain walls with cavities and disorders. Exploiting the proposed topological metamaterial, a six\uffe2\uff80\uff90way power divider is constructed and measured as a proof\uffe2\uff80\uff90of\uffe2\uff80\uff90concept of the potential of the proposed technology for future electromagnetic devices.</p", "keywords": ["topological phase transition", "0306 Physical Chemistry (incl. Structural)", "0301 basic medicine", "Technology", "0303 health sciences", "Multidisciplinary", "Science & Technology", "robust transmission of waveguide", "Chemistry", " Multidisciplinary", "Materials Science", "topological metamaterials", "Materials Science", " Multidisciplinary", "530", "7. Clean energy", "620", "Chemistry", "03 medical and health sciences", "edge state", "Physical Sciences", "0912 Materials Engineering", "reconfigurable topological edge states"]}, "links": [{"href": "https://onlinelibrary.wiley.com/doi/pdf/10.1002/admi.202200998"}, {"href": "https://doi.org/10044/1/99354"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Advanced%20Materials%20Interfaces", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10044/1/99354", "name": "item", "description": "10044/1/99354", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10044/1/99354"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-08-18T00:00:00Z"}}, {"id": "11585/785171", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:14Z", "type": "Journal Article", "created": "2020-07-12", "title": "Seismic metasurfaces on porous layered media: Surface resonators and fluid-solid interaction effects on the propagation of Rayleigh waves", "description": "zbMATH Open Web Interface contents unavailable due to conflicting licenses.", "keywords": ["metamaterials", "fluid-solid interaction", "band gaps", "13. Climate action", "Surface waves in solid mechanics", "02 engineering and technology", "Rayleigh waves", "0210 nano-technology", "Geophysical solid mechanics", "Fluid-solid interactions (including aero- and hydro-elasticity", " porosity", " etc.)", "Biot's theory", "Band gaps; Biot's theory; Fluid-solid interaction; Metamaterials; Rayleigh waves", "0201 civil engineering"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/785171/3/Seismic%20metasurfaces%20on%20porous%20layered%20media.pdf"}, {"href": "https://doi.org/11585/785171"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/International%20Journal%20of%20Engineering%20Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "11585/785171", "name": "item", "description": "11585/785171", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/11585/785171"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-09-01T00:00:00Z"}}, {"id": "11585/830573", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:14Z", "type": "Journal Article", "created": "2021-08-10", "title": "Lamb\u2019s problem for a half-space coupled to a generic distribution of oscillators at the surface", "description": "We propose an analytical framework to model the effect of single and multiple mechanical surface oscillators on the dynamics of vertically polarized elastic waves propagating in a semi-infinite medium. The formulation extends the canonical Lamb's problem, originally developed to obtain the wavefield induced by a harmonic line source in an elastic half-space, to the scenario where a finite cluster of vertical oscillators is attached to the medium surface. In short, our approach utilizes the solution of the classical Lamb's problem as Green's function to formulate the multiple scattered fields generated by the resonators. For an arbitrary number of resonators, arranged atop the elastic half-space in an arbitrary configuration, the displacement fields are obtained in closed-form and validated with numerics developed in a two-dimensional finite element environment.", "keywords": ["seismic metamaterials", "Lamb's problem", "elastic waves", "Surface waves in solid mechanics", "FOS: Physical sciences", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "02 engineering and technology", "0101 mathematics", "0210 nano-technology", "Elastic waves; Lamb\u2019s problem; Seismic metamaterials; Metasurfaces", "metasurfaces", "01 natural sciences"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/830573/4/Lambs_problems_pp.pdf"}, {"href": "https://doi.org/11585/830573"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/International%20Journal%20of%20Engineering%20Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "11585/830573", "name": "item", "description": "11585/830573", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/11585/830573"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-11-01T00:00:00Z"}}, {"id": "11585/844086", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:14Z", "type": "Journal Article", "created": "2021-12-08", "title": "Cloaking strategy for Love waves", "description": "Love waves are antiplane elastic waves which propagate along the surface of a heterogeneous medium. Under time-harmonic regime, they are governed by a scalar equation of the Helmholtz type. We exploit the invariance of this governing equation under an in-plane arbitrary coordinate transformation to design broadband cloaks for surface defects. In particular, we apply transformation elastodynamics to determine the anisotropic, position dependent, mechanical properties of ideal cloaks able to hide triangular and parabolic-shaped defects. Dispersion analysis and time-harmonic numerical simulations are employed to validate the proposed strategy. Next, we utilize layered monoclinic materials, with homogenized properties matching those of ideal cloaks, to design feasible cloaks. The performance of the layered cloaks is validated via time-harmonic numerical simulations which show a significant reduction of the defect-generated scattered fields.", "keywords": ["Love waves; Cloaking; Transformation elastodynamics; Layered media; Homogenization; Metamaterials", "0103 physical sciences", "FOS: Physical sciences", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "01 natural sciences"]}, "links": [{"href": "https://doi.org/11585/844086"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Extreme%20Mechanics%20Letters", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "11585/844086", "name": "item", "description": "11585/844086", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/11585/844086"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-01-01T00:00:00Z"}}, {"id": "11585/844088", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:14Z", "type": "Journal Article", "created": "2021-11-10", "title": "Rayleigh wave propagation in nonlinear metasurfaces", "description": "We investigate the propagation of Rayleigh waves in a half-space coupled to a nonlinear metasurface. The metasurface consists of an array of nonlinear oscillators attached to the free surface of a homogeneous substrate. We describe, analytically and numerically, the effects of nonlinear interaction force and energy loss on the dispersion of Rayleigh waves. We develop closed-form expressions to predict the dispersive characteristics of nonlinear Rayleigh waves by adopting a leading-order effective medium description. In particular, we demonstrate how hardening nonlinearity reduces and eventually eliminates the linear filtering bandwidth of the metasurface. Softening nonlinearity, in contrast, induces lower and broader spectral gaps for weak to moderate strengths of nonlinearity, and narrows and eventually closes the gaps at high strengths of nonlinearity. We also observe the emergence of a spatial gap (in wavenumber) in the in-phase branch of the dispersion curves for softening nonlinearity. Finally, we investigate the interplay between nonlinearity and energy loss and discuss their combined effects on the dispersive properties of the metasurface. Our analytical results, supported by finite element simulations, demonstrate the mechanisms for achieving tunable dispersion characteristics in nonlinear metasurfaces.", "keywords": ["Nonlinear metasurfaces", "0203 mechanical engineering", "FOS: Physical sciences", "Damped waves propagation", "Applied Physics (physics.app-ph)", "02 engineering and technology", "Nonlinear dispersion", "Damped waves propagation; Elastic metamaterials; Nonlinear dispersion; Nonlinear metasurfaces; Rayleigh waves", "Rayleigh waves", "0210 nano-technology", "Elastic metamaterials", "Applied Physics"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/844088/6/Rayleigh%20wave%20propagation%20in%20nonlinear%20metasurfaces.pdf"}, {"href": "https://doi.org/11585/844088"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20Sound%20and%20Vibration", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "11585/844088", "name": "item", "description": "11585/844088", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/11585/844088"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-03-01T00:00:00Z"}}, {"id": "11585/918865", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:14Z", "type": "Journal Article", "created": "2022-11-04", "title": "Analytical modeling of finite-size elastic metasurfaces: a multiple scattering formulation", "keywords": ["seixmic waves; metamaterials; vibration mitigation;", "02 engineering and technology", "0101 mathematics", "0210 nano-technology", "01 natural sciences"]}, "links": [{"href": "https://doi.org/11585/918865"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/2022%20Sixteenth%20International%20Congress%20on%20Artificial%20Materials%20for%20Novel%20Wave%20Phenomena%20%28Metamaterials%29", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "11585/918865", "name": "item", "description": "11585/918865", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/11585/918865"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-09-12T00:00:00Z"}}, {"id": "11585/897228", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:14Z", "type": "Journal Article", "created": "2022-06-01", "title": "A multiple scattering formulation for finite-size flexural metasurfaces", "description": "<?xml version='1.0' encoding='UTF-8'?><article><p>We provide an analytical formulation to model the propagation of elastic waves in a homogeneous half-space supporting an array of thin plates. The technique provides the displacement field obtained from the interaction between an incident wave generated by a harmonic source and the scattered fields induced by the flexural motion of the plates. The scattered field generated by each plate is calculated using an ad-hoc set of Green\u2019s functions. The interaction between the incident field and the scattered fields is modelled through a multiple scattering formulation. Owing to the introduction of the multiple scattering formalism, the proposed technique can handle a generic set of plates arbitrarily arranged on the half-space surface. The method is validated via comparison with finite element simulations considering Rayleigh waves interacting with a single and a collection of thin plates. Our framework can be used to investigate the interaction of vertically polarized surface waves and flexural resonators in different engineering contexts, from the design of novel surface acoustic wave devices to the interpretation of urban vibration problems.</p></article>", "keywords": ["elastic metamaterials; Rayleigh waves; Lamb's problem; seismic metasurfaces; structure-soil-structure interactions", "0103 physical sciences", "FOS: Physical sciences", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "02 engineering and technology", "0210 nano-technology", "01 natural sciences"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/897228/3/A_multiple_scattering_formulation_for_flexural_metasurfaces__PRSA_.pdf"}, {"href": "https://royalsocietypublishing.org/doi/pdf/10.1098/rspa.2021.0669"}, {"href": "https://doi.org/11585/897228"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Proceedings%20of%20the%20Royal%20Society%20A%3A%20Mathematical%2C%20Physical%20and%20Engineering%20Sciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "11585/897228", "name": "item", "description": "11585/897228", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/11585/897228"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-06-01T00:00:00Z"}}, {"id": "11572/356728", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:11Z", "type": "Journal Article", "created": "2022-07-18", "title": "Buckling versus unilateral constraint for a multistable metamaterial element", "description": "<?xml version='1.0' encoding='UTF-8'?><article><p>A structural element is designed and investigated, forming the basis for the development of an elastic multistable metamaterial. The leitmotif of the structural design is the implementation of a strut characterized by a bifurcation occurring at either vanishing tensile or compressive load. It is shown that buckling at null load leads to a mechanical equivalence with a unilateral constraint formulation, introducing shocks in dynamics. Towards a future analysis of the latter, the nonlinear quasi-static response is investigated, showing the multistable character of the structure, which may appear as bistable or tetrastable.</p>           <p>This article is part of the theme issue \u2018Wave generation and transmission in multi-scale complex media and structured metamaterials (part 1)\u2019.</p></article>", "keywords": ["0301 basic medicine", "03 medical and health sciences", "buckling; metamaterials; nonlinear motion; unilateral constraint; vibration control", "Classical Physics (physics.class-ph)", "FOS: Physical sciences", "Physics - Classical Physics", "02 engineering and technology", "0210 nano-technology"]}, "links": [{"href": "https://iris.unitn.it/bitstream/11572/356728/1/RSTA20220021.pdf"}, {"href": "https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2022.0021"}, {"href": "https://doi.org/11572/356728"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Philosophical%20Transactions%20of%20the%20Royal%20Society%20A%3A%20Mathematical%2C%20Physical%20and%20Engineering%20Sciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "11572/356728", "name": "item", "description": "11572/356728", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/11572/356728"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-07-18T00:00:00Z"}}, {"id": "11585/897192", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:14Z", "type": "Journal Article", "created": "2022-07-01", "title": "Topological edge states of quasiperiodic elastic metasurfaces", "description": "In this work, we investigate the dynamic behavior and the topological properties of quasiperiodic elastic metasurfaces, namely arrays of mechanical oscillators arranged over the free surface of an elastic half-space according to a quasiperiodic spatial distribution. An ad-hoc multiple scattering formulation is developed to describe the dynamic interaction between Rayleigh waves and a generic array of surface resonators. The approach allows to calculate the spectrum of natural frequencies of the quasiperiodic metasurface which reveals a fractal distribution of the frequency gaps reminiscent of the Hofstadter butterfly. These gaps have nontrivial topological properties and can host Rayleigh-like edge modes. We demonstrate that such topologically protected edge modes can be driven from one boundary to the opposite of the array by a smooth variation of the phason, a parameter which modulates the geometry of the array. Topological elastic waveguides designed on these principles provide new opportunities in surface acoustic wave engineering for vibration control, energy harvesting, and lossless signal transport, among others.", "keywords": ["Quasiperiodic structures; Rayleigh waves; Synthetic dimensions; Topological metamaterials; Edge modes", "0103 physical sciences", "FOS: Physical sciences", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "01 natural sciences"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/897192/3/topological%2bedge%2bpost%2bprint%2b.pdf"}, {"href": "https://doi.org/11585/897192"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Mechanical%20Systems%20and%20Signal%20Processing", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "11585/897192", "name": "item", "description": "11585/897192", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/11585/897192"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-12-01T00:00:00Z"}}, {"id": "11585/940480", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:14Z", "type": "Journal Article", "created": "2023-06-09", "title": "Cloaking Rayleigh waves via symmetrized elastic tensors", "description": "zbMATH Open Web Interface contents unavailable due to conflicting licenses.", "keywords": ["symmetrization", "cloaking", "metamaterials", "transformation elastodynamics", "0103 physical sciences", "Cloaking; Metamaterials; Rayleigh waves; Symmetrization; Transformation elastodynamics", "Surface waves in solid mechanics", "Rayleigh waves", "01 natural sciences", "[PHYS] Physics [physics]"]}, "links": [{"href": "https://cris.unibo.it/bitstream/11585/940480/3/1-s2.0-S0020722523000903-main.pdf"}, {"href": "https://doi.org/11585/940480"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/International%20Journal%20of%20Engineering%20Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "11585/940480", "name": "item", "description": "11585/940480", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/11585/940480"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-10-01T00:00:00Z"}}, {"id": "1807.02285", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:22Z", "type": "Journal Article", "created": "2019-02-28", "title": "Willis Metamaterial on a Structured Beam", "description": "Open Access21 pages, 3 figures", "keywords": ["[PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics]", "[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]", "[PHYS.PHYS]Physics [physics]/Physics [physics]", "Physics", "QC1-999", "FOS: Physical sciences", "Acoustics", "Physics - Applied Physics", "Applied Physics (physics.app-ph)", "530", "01 natural sciences", "Metamaterials", "0103 physical sciences", "[PHYS.PHYS] Physics [physics]/Physics [physics]"]}, "links": [{"href": "https://doi.org/1807.02285"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Physical%20Review%20X", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "1807.02285", "name": "item", "description": "1807.02285", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/1807.02285"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-02-28T00:00:00Z"}}, {"id": "20.500.11850/530215", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:38Z", "type": "Report", "title": "On the vibration attenuation properties of metamaterial design using negative stiffness elements", "keywords": ["Metamaterials; Nonlinear Dynamics; Negative stiffness"], "contacts": [{"organization": "Chondrogiannis, Kyriakos Alexandros; id_orcid0000-0003-3771-7040, Dertimanis, Vasilis, Jeremic, Boris, Chatzi, Eleni; id_orcid0000-0002-6870-240X,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/20.500.11850/530215"}, {"rel": "self", "type": "application/geo+json", "title": "20.500.11850/530215", "name": "item", "description": "20.500.11850/530215", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/20.500.11850/530215"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-01-01T00:00:00Z"}}, {"id": "20.500.11850/549998", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:38Z", "type": "Report", "title": "Computational Verification and Experimental Validation of the Vibration-Attenuation Properties of a Geometrically Nonlinear Metamaterial Design", "description": "ISSN:2331-7019", "keywords": ["Acoustic metamaterials; Earthquakes; Nonlinear acoustics; Phononic crystals; 1-dimensional systems; Bragg structures; Acoustic techniques; Numerical techniques"], "contacts": [{"organization": "Chondrogiannis, Kyriakos Alexandros; id_orcid0000-0003-3771-7040, Colombi, Andrea; id_orcid0000-0003-2480-978X, Dertimanis, Vasilis, Chatzi, Eleni; id_orcid0000-0002-6870-240X,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/20.500.11850/549998"}, {"rel": "self", "type": "application/geo+json", "title": "20.500.11850/549998", "name": "item", "description": "20.500.11850/549998", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/20.500.11850/549998"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-05-01T00:00:00Z"}}, {"id": "20.500.11850/564883", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:39Z", "type": "Journal Article", "created": "2022-08-09", "title": "Seismic resonant metamaterials for the protection of an elastic-plastic SDOF system against vertically propagating seismic shear waves (SH) in nonlinear soil", "description": "Open AccessISSN:1879-341X", "keywords": ["Seismic risk mitigation method", "Seismic metamaterials", "0211 other engineering and technologies", "02 engineering and technology", "Seismic risk mitigation method; Seismic metamaterials; Metabarrier; Multi-mass resonators; meta-SSI; Domain reduction method (DRM); Nonlinear soil; Nonlinear structure; Energy-based approach (APEDR); Real-ESSI Simulator", "meta-SSI", "0201 civil engineering", "Domain reduction method (DRM)", "Nonlinear soil", "Energy-based approach (APEDR)", "Metabarrier", "Multi-mass resonators", "Nonlinear structure", "Real-ESSI Simulator"]}, "links": [{"href": "https://doi.org/20.500.11850/564883"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Dynamics%20and%20Earthquake%20Engineering", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "20.500.11850/564883", "name": "item", "description": "20.500.11850/564883", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/20.500.11850/564883"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-03-01T00:00:00Z"}}, {"id": "20.500.11850/574194", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:39Z", "type": "Report", "title": "Application of Geometrically Nonlinear Metamaterial Device for Structural Vibration Mitigation", "description": "Open AccessISSN:2191-5652", "keywords": ["Metamaterials; Vibration mitigation; Geometric nonlinearities; Structural protection; Negative stiffness"], "contacts": [{"organization": "Chondrogiannis, Kyriakos Alexandros; id_orcid0000-0003-3771-7040, Dertimanis, Vasilis, Chatzi, Eleni; id_orcid0000-0002-6870-240X,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/20.500.11850/574194"}, {"rel": "self", "type": "application/geo+json", "title": "20.500.11850/574194", "name": "item", "description": "20.500.11850/574194", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/20.500.11850/574194"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-01-01T00:00:00Z"}}, {"id": "20.500.11850/592388", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:39Z", "type": "Report", "title": "Seismic Protection of a Reinforced Concrete Moment-Frame Building using Resonant Metamaterials: Finite Element Model Verification", "description": "Open AccessProceedings of the Third European Conference on Earthquake Engineering and Seismology \u2013 3ECEES", "keywords": ["Seismic Metamaterials", "Seismic Protection Devices", "Meta-SSI", "Domain Reduction Method (DRM)", "Metabarrier", "Real-ESSI Simulator", "Seismic Metamaterials; Seismic Protection Devices; Metabarrier; Meta-SSI; Domain Reduction Method (DRM); Real-ESSI Simulator"], "contacts": [{"organization": "Kanellopoulos, Constantinos; id_orcid0000-0002-5637-6088, Yang, Han, Jeremi\u0107, Boris, Anastasopoulos, Ioannis, Stojadinovic, Bozidar; id_orcid0000-0002-1713-1977,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/20.500.11850/592388"}, {"rel": "self", "type": "application/geo+json", "title": "20.500.11850/592388", "name": "item", "description": "20.500.11850/592388", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/20.500.11850/592388"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-01-01T00:00:00Z"}}, {"id": "20.500.11850/644470", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:26:39Z", "type": "Journal Article", "created": "2023-10-27", "title": "EXPERIMENTAL STUDY OF PHONONIC STRUCTURES WITH DDA ENHANCED UNIT-CELLS", "description": "Open AccessISSN:2623-3347", "keywords": ["Phononic structures", "Experiment", "Vibration control", "Amplification mechanism", "Metamaterials", "Phononic structures; Metamaterials; Amplification mechanism; Experiment; Vibration control"], "contacts": [{"organization": "Kalderon, Moris, Mantakas, Antonios, Chondrogiannis, Kyriakos Alexandros; id_orcid0000-0003-3771-7040, Antoniadis, Ioannis A.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/20.500.11850/644470"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Proceedings%20of%20the%208th%20International%20Conference%20on%20Computational%20Methods%20in%20Structural%20Dynamics%20and%20Earthquake%20Engineering%20%28COMPDYN%202015%29", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "20.500.11850/644470", "name": "item", "description": "20.500.11850/644470", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/20.500.11850/644470"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-01-01T00:00:00Z"}}, {"id": "2959767341", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:27:12Z", "type": "Journal Article", "created": "2019-07-15", "title": "Spontaneous Emission and Resonant Scattering in Transition from Type I to Type II Photonic Weyl Systems", "description": "Spontaneous emission and scattering behavior of an emitter or a resonant scatterer strongly depend on the density of states of the surrounding medium. It has been shown that the resonant scattering cross section (RSC) may diverge at the Weyl frequency of a type I Weyl system due to the diminishing density of states. Here we study the spontaneous emission (SE) and RSC in a photonic metacrystal across the critical transition between type I and type IIWeyl systems. Theoretical results show that the SE rate of an emitter in a type I Weyl system diminishes to zero at the Weyl frequency. When the system is tuned towards the transition point between type I and type II Weyl point, the dip in the SE spectrum at the Weyl frequency becomes infinitely sharp. The dip vanishes at the critical transition, and transforms into a peak when the system changes into a type II Weyl system. We further show that the resonant scattering cross section also exhibits dramatically different spectral features across the transition. Our study demonstrates the ability to tune SE and RSC through altering the dispersion of the Weyl medium between type I and type II, which provides a fundamentally new route in manipulating light-matter interactions.", "keywords": ["0103 physical sciences", "metamaterials; topological", "01 natural sciences"]}, "links": [{"href": "https://doi.org/2959767341"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Physical%20Review%20Letters", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "2959767341", "name": "item", "description": "2959767341", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/2959767341"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-07-15T00:00:00Z"}}, {"id": "PMC8125274", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:29:53Z", "type": "Journal Article", "created": "2021-04-29", "title": "2D Dynamic Directional Amplification (DDA) in Phononic Metamaterials", "description": "<?xml version='1.0' encoding='UTF-8'?><article><p>Phononic structures with unit cells exhibiting Bragg scattering and local resonance present unique wave propagation properties at wavelengths well below the regime corresponding to bandgap generation based on spatial periodicity. However, both mechanisms show certain constraints in designing systems with wide bandgaps in the low-frequency range. To face the main practical challenges encountered in such cases, including heavy oscillating masses, a simple dynamic directional amplification (DDA) mechanism is proposed as the base of the phononic lattice. This amplifier is designed to present the same mass and use the same damping element as a reference two-dimensional (2D) phononic metamaterial. Thus, no increase in the structure mass or the viscous damping is needed. The proposed DDA can be realized by imposing kinematic constraints to the structure\u2019s degrees of freedom (DoF), improving inertia and damping on the desired direction of motion. Analysis of the 2D lattice via Bloch\u2019s theory is performed, and the corresponding dispersion relations are derived. The numerical results of an indicative case study show significant improvements and advantages over a conventional phononic structure, such as broader bandgaps and increased damping ratio. Finally, a conceptual design indicates the usage of the concept in potential applications, such as mechanical filters, sound and vibration isolators, and acoustic waveguides.</p></article>", "keywords": ["phononic", "metamaterials", "damping", "13. Climate action", "0103 physical sciences", "02 engineering and technology", "0210 nano-technology", "7. Clean energy", "01 natural sciences", "dynamic directional amplifier", "Article"]}, "links": [{"href": "http://www.mdpi.com/1996-1944/14/9/2302/pdf"}, {"href": "https://www.mdpi.com/1996-1944/14/9/2302/pdf"}, {"href": "https://doi.org/PMC8125274"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Materials", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "PMC8125274", "name": "item", "description": "PMC8125274", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/PMC8125274"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-04-29T00:00:00Z"}}, {"id": "oai:www.research-collection.ethz.ch:20.500.11850/530215", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-30T16:35:12Z", "type": "Report", "title": "On the vibration attenuation properties of metamaterial design using negative stiffness elements", "keywords": ["Metamaterials; Nonlinear Dynamics; Negative stiffness"], "contacts": [{"organization": "Chondrogiannis, Kyriakos Alexandros; id_orcid0000-0003-3771-7040, Dertimanis, Vasilis, Jeremic, Boris, Chatzi, Eleni; id_orcid0000-0002-6870-240X,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/oai:www.research-collection.ethz.ch:20.500.11850/530215"}, {"rel": "self", "type": "application/geo+json", "title": "oai:www.research-collection.ethz.ch:20.500.11850/530215", "name": "item", "description": "oai:www.research-collection.ethz.ch:20.500.11850/530215", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/oai:www.research-collection.ethz.ch:20.500.11850/530215"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-01-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=METAMATERIALS&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=METAMATERIALS&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=METAMATERIALS&", "hreflang": "en-US"}, {"rel": "next", "type": "application/geo+json", "title": "items (next)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=METAMATERIALS&offset=50", "hreflang": "en-US"}], "numberMatched": 52, "numberReturned": 50, "distributedFeatures": [], "timeStamp": "2026-05-31T06:06:05.235685Z"}