Acoustic focusing of sub-wavelength scale achieved by multiple Fabry-Perot resonance effect

被引：13

作者：

Lin, Zhou ^{[1
]}

Guo, Xiasheng ^{[1
]}

Tu, Juan ^{[1
]}

Cheng, Jianchun ^{[1
,2
]}

Wu, Junru ^{[3
]}

Zhang, Dong ^{[1
,2
]}

机构：

[1] Nanjing Univ, Inst Acoust, Key Lab Modern Acoust MOE, Nanjing 210093, Jiangsu, Peoples R China

[2] Chinese Acad Sci, State Key Lab Acoust, Beijing 10080, Peoples R China

[3] Univ Vermont, Dept Phys, Burlington, VT 05405 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2014年 / 115卷 / 10期

基金：

中国国家自然科学基金;

关键词：

NEGATIVE REFRACTION;

D O I：

10.1063/1.4868629

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

It is demonstrated that a novel design of a multi-branch structure can converge plane acoustic waves to a focal region of sub-wavelength scale. The structure consists of multiple sub-wavelength apertures; each has length equal to the integer times that of the shortest aperture. The periodicity length of the inlet array is selected equal to the length of the structure, inducing a cooperation between the surface resonances and the Fabry-Perot (FP) resonances in apertures. The design allows FP resonances to exhibit in all apertures simultaneously, hence a multiple FP resonance is achieved. The generated evanescent waves are amplified effectively, and the acoustic focusing of sub-wavelength scale is realized within a wide frequency range, with an approximate maximum transmission gain of 7 dB. (C) 2014 AIP Publishing LLC.

引用

页数：5

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