A broadband acoustic omnidirectional absorber comprising positive-index materials

被引：75
|
作者：
Li, Rui-Qi [1 ]
Zhu, Xue-Feng [1 ]
Liang, Bin [1 ]
Li, Yong [1 ]
Zou, Xin-Ye [1 ]
Cheng, Jian-Chun [1 ]
机构：
[1] Nanjing Univ, Inst Acoust, Dept Phys, Key Lab Modern Acoust,MOE, Nanjing 210093, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2011年 / 99卷 / 19期
基金：
中国国家自然科学基金;
关键词：
PROPAGATION;
D O I：
10.1063/1.3659690
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We propose a broadband acoustic omnidirectional absorber (AOA) made of acoustic metamaterials having a positive index, which guides an incident acoustic wave into a central cavity spirally without backscattering. Numerical simulations show that the AOA has an absorption cross section remarkably larger than its cavity within a broad band, which is of potential practical significance to various applications such as sound absorption and noise control. A possible scheme for the practical realization of the AOA is also briefly discussed. VC 2011 American Institute of Physics. [doi: 10.1063/1.3659690]
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页数：3
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