Subwavelength total acoustic absorption with degenerate resonators

被引:241
作者
Yang, Min [1 ]
Meng, Chong [1 ]
Fu, Caixing [1 ]
Li, Yong [1 ]
Yang, Zhiyu [1 ]
Sheng, Ping [1 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
关键词
METAMATERIALS; RESONANCE;
D O I
10.1063/1.4930944
中图分类号
O59 [应用物理学];
学科分类号
摘要
We report the experimental realization of perfect sound absorption by sub-wavelength monopole and dipole resonators that exhibit degenerate resonant frequencies. This is achieved through the destructive interference of two resonators' transmission responses, while the matching of their averaged impedances to that of air implies no backscattering, thereby leading to total absorption. Two examples, both using decorated membrane resonators (DMRs) as the basic units, are presented. The first is a flat panel comprising a DMR and a pair of coupled DMRs, while the second one is a ventilated short tube containing a DMR in conjunction with a sidewall DMR backed by a cavity. In both examples, near perfect absorption, up to 99.7%, has been observed with the airborne wavelength up to 1.2 m, which is at least an order of magnitude larger than the composite absorber. Excellent agreement between theory and experiment is obtained. (C) 2015 AIP Publishing LLC.
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收藏
页数:5
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