Asymmetric acoustic transmission through near-zero-index and gradient-index metasurfaces
Asymmetric acoustic transmission through near-zero-index and gradient-index metasurfaces
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DOI：
10.1063/1.4953264
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发表时间：
2016-05-30
影响因子：
4
通讯作者：
Jing, Yun
中科院分区：
文献类型：
--
作者：
Shen, Chen;Xie, Yangbo;Jing, Yun
我们提出了一种声学超表面的设计，它在一定频段内产生非对称传输。该设计由一层梯度折射率超表面和一层低折射率超表面组成。入射波以一种与波矢量相关的方式被控制，以产生强烈的非对称传输。数值模拟表明，该方法在设计频段内的两个入射方向之间提供了高传输对比度。这通过实验得到了进一步验证。与先前的设计相比，所提出的方法产生了一种紧凑的平面器件。我们的设计可能会在诸如噪声控制和治疗超声等各种场景中得到应用。由美国物理联合会出版社出版。
We present a design of acoustic metasurfaces yielding asymmetric transmission within a certain frequency band. The design consists of a layer of gradient-index metasurface and a layer of low refractive index metasurface. Incident waves are controlled in a wave vector dependent manner to create strong asymmetric transmission. Numerical simulations show that the approach provides high transmission contrast between the two incident directions within the designed frequency band. This is further verified by experiments. Compared to previous designs, the proposed approach yields a compact and planar device. Our design may find applications in various scenarios such as noise control and therapeutic ultrasound. Published by AIP Publishing.