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

Chen Shen; Yangbo Xie; Junfei Li; Steven A. Cummer; Yun Jing

doi:10.1063/1.4953264

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

Chen Shen, Yangbo Xie, Junfei Li, Steven A. Cummer, Yun Jing

Graduate Program in Acoustics

Research output: Contribution to journal › Article › peer-review

154 Scopus citations

Abstract

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.

Original language	English (US)
Article number	223502
Journal	Applied Physics Letters
Volume	108
Issue number	22
DOIs	https://doi.org/10.1063/1.4953264
State	Published - May 30 2016

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4953264

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title = "Asymmetric acoustic transmission through near-zero-index and gradient-index metasurfaces",

abstract = "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.",

author = "Chen Shen and Yangbo Xie and Junfei Li and Cummer, {Steven A.} and Yun Jing",

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AU - Shen, Chen

AU - Xie, Yangbo

AU - Li, Junfei

AU - Cummer, Steven A.

AU - Jing, Yun

PY - 2016/5/30

Y1 - 2016/5/30

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AB - 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.

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

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