207 citations · 1.8k across the 36 of their papers we have counts for
36 papers
Observation of Two-Dimensional Acoustic Bound States in the Continuum
Marc Martí-Sabaté, Junfei Li, Bahram Djafari-Rouhani +2
The design of devices based on acoustic or optical fields requires the fabrication of cavities and structures capable of efficiently trapping these waves. A special type of cavity…
Bound states in the continuum in circular clusters of scatterers
Marc Martí-Sabaté, Bahram Djafari-Rouhani, Dani Torrent
In this work, we study the localization of flexural waves in highly symmetric clusters of scatterers. It is shown that when the scatterers are placed regularly in the perimeter of…
High-Quality Resonances in Quasi-Periodic Clusters of Scatterers for Flexural Waves
Marc Martí-Sabaté, Sébastien Guenneau, Dani Torrent
Multiple scattering theory is applied to the study of clusters of point-like scatterers attached to a thin elastic plate and arranged in quasi-periodic distributions. Two type of s…
Far-field Perfect Imaging with Time Modulated Gratings
Pawel Packo, Dani Torrent
We study the capabilities of time-modulated diffraction gratings as imaging devices. It is shown that a time-dependent but transversally homogeneous slab can be used to make a perf…
Zak's Phase in Non-Symmetric One-Dimensional Crystals
Marc Martí-Sabaté, Dani Torrent
In this work, we derive some analytical properties of Berry's phase in one-dimensional quantum and classical crystals, also named Zak's phase, when computed with a Fourier basis. W…
Edge modes for flexural waves in quasi-periodic linear arrays of scatterers
Marc Martí-Sabaté, Dani Torrent
We present a multiple scattering analysis of robust interface states for flexural waves in thin elastic plates. We show that finite clusters of linear arrays of scatterers built on…
Strong Spatial Dispersion in Time-Modulated Dielectric Media
Dani Torrent
We present an effective medium description of time-modulated dielectric media. By taking the averaged fields over one modulation period, the relationship between them is derived, d…
Metaclusters for the Full Control of Mechanical Waves
Pawel Packo, Andrew Norris, Dani Torrent
We present a new method for the control of waves based on inverse multiple scattering theory. Conceived as a generalization of the concept of metagrating, we call metaclusters to a…
Dipolar localization of waves in twisted phononic crystal plates
Dani Torrent, Marc Martí-Sabaté
The localization of waves in two-dimensional clusters of scatterers arranged in relatively twisted lattices is studied by multiple scattering theory. It is found that, for a given…
Generalized Elastodynamic Model for Nanophotonics
J. V. Alvarez, Bahram Djafari-Rouhani, Dani Torrent
A self-consistent theory for the classical description of the interaction of light and matter at the nano-scale is presented, which takes into account spatial dispersion. Up to now…
Majorana-like zero modes in Kekulé distorted sonic lattices
Penglin Gao, Daniel Torrent, Francisco Cevera +3
Topological phases have recently been realised in bosonic systems. The associated boundary modes between regions of distinct topology have been used to demonstrate robust waveguidi…
Direct retrieval method of the effective permittivity and permeability of bulk semi-infinite metamaterials by variable-angle spectroscopic ellipsometry
Quentin Flamant, Daniel Torrent, Sergio Gomez-Graña +5
In this work, we present a simple method for the direct retrieval of the effective permittivity and permeability of a bulk semi-infinite metamaterial from variable-angle spectrosco…
Mechanical analogue of a Majorana bound state
Chun-Wei Chen, Natalia Lera, Rajesh Chaunsali +5
The discovery of topologically non-trivial electronic systems has opened a new age in condensed matter research. From topological insulators to topological superconductors and Weyl…
Gradient index phononic crystals and metamaterials
Yabin Jin, Bahram Djafari-Rouhani, Daniel Torrent
Phononic crystals and acoustic metamaterials are periodic structures whose effective properties can be tailored at will to achieve extreme control on wave propagation. Their refrac…
Valley Hall phases in Kagome lattices
Natalia Lera, Daniel Torrent, Pablo San-Jose +2
We report the finding of the analogous valley Hall effect in phononic systems arising from mirror symmetry breaking, in addition to spatial inversion symmetry breaking. We study to…
Ultrathin acoustic parity-time symmetric metasurface cloak
Hao-Xiang Li, Maria Rosendo-Lopez, Yi-Fan Zhu +5
Invisibility or unhearability cloaks have been made possible by using metamaterials making light or sound flow around obstacle without the trace of reflections or shadows. Metamate…
Engineered diffraction gratings for acoustic cloaking
Yabin Jin, Xinsheng Fang, Yong Li +1
We show that engineered diffraction gratings can considerably simplify the design and performance of acoustic devices. Acoustic reflecting gratings based on rectangular cavities dr…
The Inverse Grating Problem: Efficient Design of Anomalous Flexural Wave Reflectors and Refractors
Pawel Packo, Andrew N. Norris, Daniel Torrent
We present an extensive formulation of the inverse grating problem for exural waves, in which the energy of each diffracted mode is selected and the grating configuration is then o…
Acoustic Anomalous Reflectors Based on Diffraction Grating Engineering
Daniel Torrent
We present an efficient method for the design of anomalous reflectors for acoustic waves. The approach is based on the fact that the anomalous reflector is actually a diffraction g…
Analysis of the Robustness of Conventional and Topologically Protected Edge States in Phononic Crystal Plates
Yabin Jin, Daniel Torrent, Bahram Djafari-Rouhani
In this work we theoretically study the interface acoustic states of resonators on a thin plate with topologically protected and conventional designs. Topologically protected inter…
Loss Compensation in Time-Dependent Elastic Metamaterials
Daniel Torrent, William J. Parnell, Andrew N. Norris
Materials with properties that are modulated in time are known to display wave phenomena showing energy increasing with time, with the rate mediated by the modulation. Until now th…
Non-Reciprocal Thermal Material by Spatio-Temporal Modulation
Daniel Torrent, Olivier Poncelet, Jean-Chirstophe Batsale
The thermal properties of a material with a spatio-temporal modulation in both the thermal conductivity and the mass density are studied. The special configuration studied here con…
Hierarchical self-assembly of nanoparticles for optical metamaterials
Sergio Gomez-Graña, Aurélie Le Beulze, Mona Treguer-Delapierre +15
Hierarchical self-assembly arranges nanostructures at different length scales. It gradually becomes an effective method of fabricating artificial metamaterials from composite nanos…
Resonant and Non-Local Properties of Phononic Metasolids
Daniel Torrent, Yan Pennec, Bahram Djafari-Rouhani
We derive a general theory of effective properties in metasolids based on phononic crystals with low frequency resonances. We demonstrate that in general these structures need to b…