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Wide-band acoustic collimating by phononic crystal composites

Appl. Phys. Lett. 92, 111901 (2008); doi:10.1063/1.2895019

Published 17 March 2008

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Jinjie Shi, Sz-Chin Steven Lin, and Tony Jun Huang
Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
We numerically investigated the collimation phenomena in phononic crystal (PC) composites, a sequenced series of PCs with the same period but different filling ratios. The plane wave expansion (PWE) method was used to obtain the band diagrams and the equal frequency surfaces of both single PCs and PC composites. The finite difference time domain (FDTD) method was then utilized to simulate the propagation of acoustic waves inside a PC composite. The results from both PWE calculations and FDTD simulations show that in comparison to a single PC, a PC composite can significantly enlarge the collimation region and realize wide-band acoustic collimation. ©2008 American Institute of Physics
History: Received 11 October 2007; accepted 8 January 2008; published 17 March 2008
Permalink: http://link.aip.org/link/?APPLAB/92/111901/1
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KEYWORDS and PACS

Keywords
PACS
  • 63.20.-e
    Phonons in crystal lattices
  • 62.65.+k
    Acoustical properties of solids
  • 71.20.-b
    Electronic structure of crystalline solids
  • YEAR: 2008

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ISSN:
0003-6951 (print)   1077-3118 (online)
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