Journal
PHYSICA B-CONDENSED MATTER
Volume 403, Issue 19-20, Pages 3599-3603Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2008.05.038
Keywords
Sonic crystal; Negative refraction
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Dispersion characteristics of negative refraction sonic crystals are investigated. The plane wave expansion method is used to calculate the equifrequency surface; the dependences of refractive direction on frequencies and incident angles for triangular lattices are shown. There exist the positive and negative refractive waves which include k . V-g >= 0 and k . V-g <= 0 in the second band for the triangular system. We also use the finite element method to demonstrate that the relative intensity of the transmitted acoustic waves is dependent on incident frequencies and angles. The positions of the partial band gaps obtained by the plane wave expansion method are in good agreement with those obtained by the finite element method. The sonic crystals with negative effective index are shown to have higher transmission intensities. By using the negative refraction behavior, we can design a sonic crystal plane lens to focus a sonic wave. Crown Copyright (c) 2008 Published by Elsevier B.V. All rights reserved.
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