Phys. Rev. Lett. 93, 024301 (2004) [4 pages]

Focusing of Sound in a 3D Phononic Crystal

Abstract

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Suxia Yang^1,2,*, J. H. Page¹, Zhengyou Liu³, M. L. Cowan^1,†, C. T. Chan², and Ping Sheng²
¹Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
²Department of Physics, Hong Kong University of Science and Technology, Kowloon, Hong Kong, China
³Department of Physics, Wuhan University, Wuhan 430072, China

Received 1 March 2004; published 7 July 2004

See accompanying Physics Focus

We present a combined experimental and theoretical study of phonon focusing phenomena in a pass band above the complete band gap in a 3D phononic crystal. Wave propagation was found to depend dramatically on both frequency and incident direction. This propagation anisotropy leads to very large negative refraction, which can be used to focus a diverging ultrasonic beam into a narrow focal spot with a large focal depth. The experimental field patterns are well explained using a Fourier imaging technique, based on the 3D equifrequency surfaces calculated from multiple scattering theory.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.93.024301

DOI:

10.1103/PhysRevLett.93.024301

PACS:

43.35.+d, 63.20.–e

^*Current address: Dept. of Materials Science Eng., Univ. of Toronto, Toronto, ON, Canada M5S 3E4.

^†Current address: Department of Physics, Univ. of Toronto, Toronto, ON, Canada M5S 3E3.

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Phys. Rev. Lett. 93, 024301 (2004) [4 pages]

Focusing of Sound in a 3D Phononic Crystal