Asymmetric acoustic transmission through near-zero-index and gradient-index metasurfaces

被引：163
作者：
Shen, Chen [1 ]
Xie, Yangbo [2 ]
Li, Junfei [2 ]
Cummer, Steven A. [2 ]
Jing, Yun [1 ]
机构：
[1] N Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC 27695 USA
[2] Duke Univ, Dept Elect & Comp Engn, Durham, NC 27708 USA
来源：
APPLIED PHYSICS LETTERS | 2016年 / 108卷 / 22期
关键词：
LIGHT-PROPAGATION; SOUND; REFLECTION; REFRACTION;
D O I：
10.1063/1.4953264
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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.
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页数：4
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