Multifunctional solid/solid phononic crystal

A two-dimensional, solid/solid phononic crystal (PC) comprised a square array of steel cylinders in epoxy is shown to perform a variety of spectral, wave vector, and phase-space functions. Over a range of operating frequencies, the PC’s elastic band structure shows uniquely shaped equifrequency cont...

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Bibliographic Details
Published in:Journal of applied physics 2012-07, Vol.112 (2)
Main Authors: Swinteck, N., Vasseur, J. O., Hladky-Hennion, A. C., Croënne, C., Bringuier, S., Deymier, P. A.
Format: Article
Language:English
Subjects:
Acoustics
Arrays
Condensed Matter
Crystals
Devices
Elastic waves
Finite difference method
Materials Science
Multiplexing
Physics
Polycarbonates
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Summary:A two-dimensional, solid/solid phononic crystal (PC) comprised a square array of steel cylinders in epoxy is shown to perform a variety of spectral, wave vector, and phase-space functions. Over a range of operating frequencies, the PC’s elastic band structure shows uniquely shaped equifrequency contours that are only accessible to excitations of longitudinal polarization. Under this condition, the PC is shown to behave as (1) an acoustic wave collimator, (2) a defect-less wave guide, (3) a directional source for elastic waves, (4) an acoustic beam splitter, (5) a phase-control device, and (6) a k-space multiplexer. Wave vector diagrams and finite-difference time-domain simulations are employed to authenticate the above mentioned capabilities.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4739264