Journal ArticleDOI
Transmittivity through straight and stublike waveguides in a two-dimensional phononic crystal
Abdelkrim Khelif,Bahram Djafari-Rouhani,J. O. Vasseur,Pierre A. Deymier,Ph. Lambin,Leonard Dobrzynski +5 more
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In this paper, 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, is studied.Abstract:
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 The primary effect of this resonatoris to induce zeros of transmission in the transmission spectrum of the perfect waveguide The transmittivity exhibits very narrow dips whose frequencies depend upon the width and the length of the stub When a gap exists in the transmittivity of the perfect waveguide, the stub may also permit selective frequency transmission in this gap We have considered phononic crystals constituted by either fluid or solid constituents The calculations of the band structure and transmittivity are performed by a combination of finite-difference time domain and plane-wave expansion methodsread more
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Two-dimensional phononic crystals: Examples and applications
Yan Pennec,Jérôme Olivier Vasseur,Bahram Djafari-Rouhani,Leonard Dobrzynski,Pierre A. Deymier +4 more
TL;DR: In this article, the authors present some examples of two-dimensional bulk phononic crystals (i.e., arrays of inclusions assumed of infinite extent along the three spatial directions) and show that the bandwidth of the forbidden band depends strongly on the nature of the constituent materials (solid or fluid), as well as the contrast between the physical characteristics (density and elastic moduli) of the inclusions and of the matrix, the geometry of the array of inclusion, the inclusion shape and the filling factor.
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Guiding and bending of acoustic waves in highly confined phononic crystal waveguides
TL;DR: In this paper, the authors demonstrate the guiding and bending of acoustic waves in highly confined waveguides formed by removing rods from a periodic two-dimensional lattice of steel cylinders immersed in water.
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Two dimensional phononic crystal with tunable narrow pass band: application to a waveguide with selective frequency
Abdelkrim Khelif,Pierre A. Deymier,Bahram Djafari-Rouhani,Jérôme Olivier Vasseur,Leonard Dobrzynski +4 more
TL;DR: In this article, the propagation of elastic waves in two-dimensional composite media composed of a square array of hollow steel cylinders embedded in water using the finite-difference time-domain method was studied.
Journal ArticleDOI
Sonic crystals and sonic wave-guides
TL;DR: In this article, the authors present a review on the fundamental physical aspects, methods of theoretical analyses, experimental techniques to realize two-dimensional sonic crystals, wave-guides and coupled waveguides, and finally ideas of sonic circuits built in sonic-crystal slabs.
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Harnessing Multiple Folding Mechanisms in Soft Periodic Structures for Tunable Control of Elastic Waves
TL;DR: In this article, the authors focus on an elastomeric porous structure comprising a triangular array of circular holes, and show that by controlling the loading direction, multiple pattern transformations can be induced by buckling.