Focusing of sound in a 3D phononic crystal

被引：553

作者：

Yang, SX

Page, JH

Liu, ZY

Cowan, ML

Chan, CT

Sheng, P

机构：

[1] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada

[2] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China

[3] Wuhan Univ, Dept Phys, Wuhan 430072, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 02期

基金：

加拿大自然科学与工程研究理事会; 中国国家自然科学基金;

关键词：

D O I：

10.1103/PhysRevLett.93.024301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页码：024301 / 1

页数：4

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