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Focusing of Sound in a 3D Phononic Crystal

Suxia Yang, J. H. Page, Zhengyou Liu, M. L. Cowan, C. T. Chan, and Ping Sheng
Phys. Rev. Lett. 93, 024301 – Published 7 July 2004
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Abstract

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.

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  • Received 1 March 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.024301

©2004 American Physical Society

Authors & Affiliations

Suxia Yang1,2,*, J. H. Page1, Zhengyou Liu3, M. L. Cowan1,†, 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

  • *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.

See Also

Focusing Sound without a Lens

David Lindley
Phys. Rev. Focus 14, 3 (2004)

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Issue

Vol. 93, Iss. 2 — 9 July 2004

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