B. Djafari-Rouhani | Acoustic band structure of periodic elastic composites

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Experimental and Theoretical Evidence for the Existence of Absolute Acoustic Band Gaps in Two-Dimensional Solid Phononic Crystals J. O. Vasseur,1,* P. A. Deymier,2 B. Chenni,3 B. Djafari-Rouhani,1 We report on the experimental observation of the existence and the interaction of localized defect modes in a full acoustic band gap in a two-dimensional lattice of steel cylinders immersed in water. The confinement of defect modes and the splitting of their resonance frequencies are observed and are explained by their evanescent coupling. A different type of Transmission and dispersion relations of perfect and defect-containing waveguide structures in phononic band gap materials A. Khelif 1, B. Djafari-Rouhani 2, J. O. Vasseur 2,*, and P. A. Deymier 3

‪Shanghai Jiao Tong University‬ – ‪‪1.045 citacions‬‬ Friedrich-Wintgen bound states in the continuum in a photonic and plasmonic T -shaped cavity: Application to filtering and sensing Soufyane Khattou 1, Yamina Rezzouk 1, Madiha Amrani 1, Mohamed El Ghafiani 1, El Houssaine El Boudouti 1,*, Abdelkrim Talbi 2, and Bahram Djafari-Rouhani 3 PDF We present a theoretical Cité Scientifique 59652 study of the bulk and surface magnons of a semi-infinite stack of two different ferromagnetic films. Each film is modeled by a simple-cubic lattice of spins coupled via nearest-neighbor exchange (Heisenberg ferromagnet). The superlattice has a larger periodicity in the direction perpendicular to the slabs and therefore many magnon branches in the folded

We investigate the possibility of designing phononic crystal-based devices for telecommunication applications using materials commonly employed in microfabrication. We focus our attention on a phononic crystal made of a square array of cylindrical holes drilled in an active piezoelectric PZT5A matrix. Two different structures are considered, namely, a freestanding phononic without a cap layer We present a design of a pillared phononic crystal based structure for Love wave manipulation to achieve high mass sensitivity. The structure is made of phononic micro-pillars constructed by stacking tungsten and SiO 2 layers, distributed on a substrate designed for Love wave propagation. The multilayered pillar allows the creation of bandgaps, which leads to the

Acoustic band structure of periodic elastic composites

Acoustic band structure of periodic elastic composites M. Kushwaha (1) , P. Halevi (1) , L. Dobrzynski (2) , B. Djafari-Rouhani (3) Afficher plus de détails 1 BUAP – Benemérita Universidad Autónoma de Puebla 2 PHYSIQUE – IEMN – Physique – IEMN 3 LDSMM – Laboratoire de dynamique et structure des matériaux moléculaires

Sonic crystals consisting of three-dimensional arrays of units which exhibit localized resonances have been discovered recently. Here, it is shown that their two-dimensional counterparts behave in a similar manner. Particularly, it is observed that the transmittance spectra show very asymmetric peaks which are explained as a Fano-like interference phenomenon. A B.Djafari-Rouhani and L. Dobrzynski des Surfaces et Interfaces, Institut pillar allows the creation of Superieur d’Electronique 3 rue Francois Baes, F-59046 Lille Cedex, France du Nord, It is known that the transmission spectrum of the so-called locally resonant phononic crystal can exhibit absolute sharp dips in the sonic frequency range due to the resonance scattering of elastic waves. In this paper, we study theoretically, using a finite difference time domain method, the propagation of acoustic waves through a two-dimensional

Comment on “Acoustic Band Structure of Periodic Elastic Composites”
Acoustic band structure of periodic elastic composites
On the Proximal Point Algorithm
Bound states in the continuum in circular clusters of scatterers

Rayleigh waves on a superlattice stratified normal to the surface B. Djafari-Rouhani, A. A. Maradudin, and R. F. Wallis Phys. Rev. B 29, 6454 (1984) – Published 15 June, 1984 We present the first full band-structure calculations for periodic, elastic composites. For transverse polarization of the vibrations we obtain a „phononic“ band gap which extends throughout the Brillouin zone. A complete acoustic gap or a low density of states should have important consequences for the suppression of zero-point motion and for the localization

Complete acoustic band gaps in periodic fibre reinforced composite materials: the carbon/epoxy composite and some metallic systems, J O Vasseur, B Djafari-Rouhani, L Dobrzynski, M S Kushwaha, P Halevi In the frame of long-wavelength Heisenberg model, a simple magnonic device is designed to obtain possibly transmission stop bands (where the propagation of spin waves is forbidden). This simple device is composed of an infinite one-dimensional mono-mode waveguide (the backbone) along which ? (? ′) side resonators are grafted at two sites. Contrary to all known

We study theoretically and experimentally the existence and behavior of the localized surface modes in one-dimensional (1D) quasiperiodic photonic band gap structures. These structures are made of segments and loops arranged according to a Fibonacci sequence. The experiments are carried out by using coaxial cables in the frequency region of a few tens Erratum Erratum: Giant gaps in photonic band structures [Phys. Rev. B 57, 9388 (1998)] L. Dobrzynski, A. Akjouj, B. Djafari-Rouhani, J. O. Vasseur, and J. Zemmouri Rayleigh Waves in Phononic Crystal Made of Multilayered Pillars: Confined Modes, Fano Resonances, and Acoustically Induced Transparency M. Oudich 1,*, B. Djafari-Rouhani 2, B. Bonello 3, Y. Pennec 2, S. Hemaidia 1, F. Sarry 1, and D. Beyssen 1 PDF Share

Experimental measurements of acoustic transmission through a solid-solid two-dimensional binary-composite medium constituted of a triangular array of parallel circular steel cylinders in an epoxy matrix are reported. Attention is restricted to propagation of elastic waves perpendicular to the cylinders. Measured transmitted spectra demonstrate the existence of Experimental measurements of acoustic transmission through a solid-solid two-dimensional binary-composite medium constituted of a triangular array of parallel circular steel cylinders in an epoxy matrix are reported. Attention is restricted to propagation of elastic waves perpendicular to the cylinders. Measured transmitted spectra demonstrate the existence of ‪Imperial College London‬ – ‪‪Citado por 108‬‬ – ‪Physics‬ – ‪Applied Maths‬

A general framework of bound states in the continuum in an open acoustic resonator, Phys. Rev. Applied 18, 054021 (2022). T. Mrabti, Z. Labdouti, A. Mouadili, E. El Boudouti, and B. Djafari-Rouhani, Aharonov-Bohm-effect induced transparency and reflection in mesoscopic rings side coupled to a quantum wire, Phys. E 116, 113770 (2020). Bound states in of transmission in the transmission the continuum (BICs) are zero-width (infinite lifetime) trapped eigenmodes that remain confined in the system even though they coexist with a continuum of extended states. The resulting high-frequency resonances may have significant applications in photonic integrated circuits, filtering, sensing, and laser. In this paper, we demonstrate that a

‪Fudan University‬ – ‪‪引用次数：3,143 次‬‬ – ‪wave motion‬ – ‪phononic crystals‬ – ‪noise and vibration control‬ – ‪intelligent structural design‬ Y. Pennec, B. Djafari-Rouhani, H. Larabi, J. O. Vasseur, and A. C. Hladky-Hennion Institut d’Electronique de Microélectronique et de Nanotechnologie, UMR CNRS 8520, Cité Scientifique, 59652 Villeneuve d’Ascq Cedex, France Received 13 June 2008; revised manuscript received 4 August 2008; published 5 September 2008 Original Article Acoustic band structure of periodic elastic composites M. S. Kushwaha, P. Halevi, L. Dobrzynski, and B. Djafari-Rouhani

EISEVIER Physics Letters A 248 (1998) 252-256 9 November 1998 PHYSICS LETTERS A Sound isolation from cubic arrays of air bubbles in water M.S. Kushwaha 1, B. Djafari-Rouhani, L. Dobrzynski Laboratoire de Dynamique et Structures des Matiriaux Moliculaires, U.R.A.CN.R.S. No. 801, UER. de Physique, University de Lille 1, F59655 Rayleigh waves on a superlattice stratified normal to the surface B. Djafari-Rouhani A. A. Maradudin and R. F. Wallis PDF The vibrational eigenmodes of dumbbell-shaped polystyrene nanoparticles are recorded by Brillouin light spectroscopy (BLS), and the full experimental spectra are calculated theoretically. Different from spheres with a degeneracy of (2 ? + 1), with ? being the angular momentum quantum number, the eigenmodes of dumbbells are either singly or doubly

Lightweight sound-absorbing metastructures with perforated fish-belly panels Yabin Jin a, Yilong Yang a , Zhihui Wen a , Liangshu He a , Yu Cang a , Bin Yang a, Bahram Djafari-Rouhani c, Yong Li b, Yan Li a Show more Add to Mendeley Cite We report on the occurrence of strong nonlinear acousto-optic interactions in a one-dimensional model phoxonic cavity that supports, simultaneously, photonic and phononic localized resonant modes, by means of rigorous tens Erratum Erratum Giant gaps electrodynamic and elastodynamic calculations. We show that these interactions can take place when photons and phonons of long lifetime are Flat band induced topological photonic Tamm states in stubbed structures: Theory and experiment Soufyane Khattou 1, Yamina Rezzouk 1, Mohamed El Ghafiani 1, Madiha Amrani 1, Mohammed Elaouni 1, El Houssaine El Boudouti 1,*, Abdelkrim Talbi 2, Abdellatif Akjouj 3, and Bahram Djafari-Rouhani 3 PDF Share

We study theoretically the propagation of acoustic waves through a linear waveguide, created inside a two-dimensional phononic crystal, along which a side branch (or stub) is attached. Shanghai Jiao Tong University 1 The primary effect of this resonator is to induce zeros of transmission in the transmission spectrum of the perfect waveguide. The transmittivity exhibits very narrow dips

We demonstrate experimentally the guiding and the bending of acoustic waves in highly confined waveguides formed by removing rods from a periodic two-dimensiona N-layer superlattices are formed out of a periodic repetition of N different slabs. Such materials for N=3 and 4 are now easily grown by molecular-beam epitaxy. We present closed form expressions for localized and resonant transverse elastic waves associated with the surface of a semi-infinite N-layer superlattice, with or without a cap layer, and in contact either

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B. Djafari-Rouhani | Acoustic band structure of periodic elastic composites

Acoustic band structure of periodic elastic composites