Acoustic metasurface with hybrid resonances
Acoustic metasurface with hybrid resonances
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DOI：
10.1038/nmat3994
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发表时间：
2014-09-01
期刊：
影响因子：
41.2
通讯作者：
Sheng, Ping
中科院分区：
文献类型：
--
作者：
Ma, Guancong;Yang, Min;Sheng, Ping
阻抗匹配的表面具有入射波不产生反射的特性。在这里，我们证明，通过使用简单的结构，声反射表面可以获得混合共振，并在可调频率下与空气中的声音进行阻抗匹配，从而不会产生反射。变表面的每个共振单元在其所有空间维度上都是深亚波长，其厚度比峰值吸收路径长度小两个数量级。由于可能没有传输，因此阻抗匹配的声波在一个或多个频率上被完全吸收，或者被转换成其他形式的能量(S)，例如电流。获得了高达23%的声电能量转换效率。
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 wayelength 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.