Subwavelength imaging of acoustic waves by a canalization mechanism in a two-dimensional phononic crystal

被引：55

作者：

He, Zhaojian

Cai, Feiyan

Ding, Yiqun

Liu, Zhengyou ^{[1
]}

机构：

[1] Wuhan Univ, Key Lab Acoust & Photon Mat, Wuhan 430072, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 23期

基金：

中国国家自然科学基金;

关键词：

acoustic imaging; acoustic wave transmission; phononic crystals;

D O I：

10.1063/1.3043684

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this letter, the subwavelength imaging of acoustic waves is reported based on a mechanism that the evanescent modes of a source are canalized by the Bloch modes of a two-dimensional phononic crystal that served as the lens. The phononic crystal was designed to have a thickness that meets the condition of Fabry-Perot resonance in order to enhance wave transmission and hence to improve imaging performance. Numerical simulations demonstrated that for a point acoustic source an image as small as 0.16 lambda can be formed.

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页数：3

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