Long-range nonspreading propagation of ...
Document type :
Compte-rendu et recension critique d'ouvrage
Title :
Long-range nonspreading propagation of sound beam through periodic layered structure
Author(s) :
Zubov, Yurii [Auteur]
University of North Texas [UNT]
Djafari-Rouhani, Bahram [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Physique - IEMN [PHYSIQUE - IEMN]
Jin, Yuqi [Auteur]
University of North Texas [UNT]
Sofield, Mathew [Auteur]
University of North Texas [UNT]
Walker, Ezekiel [Auteur]
University of North Texas [UNT]
Neogi, Arup [Auteur correspondant]
University of North Texas [UNT]
Krokhin, Arkadii [Auteur correspondant]
University of North Texas [UNT]
University of North Texas [UNT]
Djafari-Rouhani, Bahram [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Physique - IEMN [PHYSIQUE - IEMN]
Jin, Yuqi [Auteur]
University of North Texas [UNT]
Sofield, Mathew [Auteur]
University of North Texas [UNT]
Walker, Ezekiel [Auteur]
University of North Texas [UNT]
Neogi, Arup [Auteur correspondant]
University of North Texas [UNT]
Krokhin, Arkadii [Auteur correspondant]
University of North Texas [UNT]
Journal title :
Communications Physics
Pages :
155, 8 pages
Publisher :
Nature Research
Publication date :
2020-09-02
ISSN :
2399-3650
HAL domain(s) :
Sciences de l'ingénieur [physics]
English abstract : [en]
Linear spreading of a wave packet or a Gaussian beam is a fundamental effect known in evolution of quantum state and propagation of optical/acoustic beams. The rate of spreading is determined by the diffraction coefficientDwhich ...
Show more >Linear spreading of a wave packet or a Gaussian beam is a fundamental effect known in evolution of quantum state and propagation of optical/acoustic beams. The rate of spreading is determined by the diffraction coefficientDwhich is proportional to the curvature of the isofrequency surface. Here, we analyzed dispersion of sound in a solid-fluid layered structure and found a flex point on the isofrequency curve whereDvanishes for given direction of propagation and frequency. Nonspreading propagation is experimentally observed in a water steel lattice of 75 periods (similar to 1 meter long) and occurs in the regime of anomalous dispersion and strong acoustic anisotropy when the effective mass along periodicity is close to zero. Under these conditions the incoming beam experiences negative refraction of phase velocity leading to backward wave propagation. The observed effect is explained using a complete set of dynamical equations and our effective medium theory.Show less >
Show more >Linear spreading of a wave packet or a Gaussian beam is a fundamental effect known in evolution of quantum state and propagation of optical/acoustic beams. The rate of spreading is determined by the diffraction coefficientDwhich is proportional to the curvature of the isofrequency surface. Here, we analyzed dispersion of sound in a solid-fluid layered structure and found a flex point on the isofrequency curve whereDvanishes for given direction of propagation and frequency. Nonspreading propagation is experimentally observed in a water steel lattice of 75 periods (similar to 1 meter long) and occurs in the regime of anomalous dispersion and strong acoustic anisotropy when the effective mass along periodicity is close to zero. Under these conditions the incoming beam experiences negative refraction of phase velocity leading to backward wave propagation. The observed effect is explained using a complete set of dynamical equations and our effective medium theory.Show less >
Language :
Anglais
Popular science :
Non
Source :
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