Acoustic metasurface with hybrid resonances

被引：0
作者：
Ma G. [1 ]
Yang M. [1 ]
Xiao S. [1 ]
Yang Z. [1 ]
Sheng P. [1 ,2 ]
机构：
[1] Department of Physics, Hong Kong University of Science and Technology, Kowloon, ClearWater Bay
[2] Institute for Advanced Study, Hong Kong University of Science and Technology, Kowloon, ClearWater Bay
来源：
Nature Materials | 2014年 / 13卷 / 9期
关键词：
D O I：
10.1038/nmat3994
中图分类号：
学科分类号：
摘要：
An impedance-matched surface has the property that an incident wave generates no reflection. Here we demonstrate that by using a simple construction, an acoustically reflecting surface can acquire hybrid resonances and becomes impedance-matched to airborne sound at tunable frequencies, such that no reflection is generated. Each resonant cell of the metasurface is deep-subwavelength in all its spatial dimensions, with its thickness less than the peak absorption wavelength by two orders of magnitude. As there can be no transmission, the impedance-matched acoustic wave is hence either completely absorbed at one or multiple frequencies, or converted into other form(s) of energy, such as an electrical current. A high acoustic-electrical energy conversion efficiency of 23% is achieved. © 2014 Macmillan Publishers Limited.
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页码：873 / 878
页数：5
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