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

被引：53
|
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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