Extremely Asymmetrical Acoustic Metasurface Mirror at the Exceptional Point

Xu Wang, Xinsheng Fang, Dongxing Mao, Yun Jing, and Yong Li
Phys. Rev. Lett. 123, 214302 – Published 22 November 2019
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Abstract

Previous research has attempted to minimize the influence of loss in reflection- and transmission-type acoustic metasurfaces. This Letter shows that, by treating the acoustic metasurface as a non-Hermitian system and by harnessing loss, unconventional wave behaviors that do not exist in lossless metasurfaces can be uncovered. Specifically, we theoretically and experimentally demonstrate a non-Hermitian acoustic metasurface mirror featuring extremely asymmetrical reflection at the exception point. As an example, the metasurface mirror is designed to have high-efficiency retroreflection when the wave comes from one side and near-perfect absorption when the wave comes from the opposite side. This work marries conventional gradient index metasurfaces with the exceptional point from non-Hermitian systems, and it paves the way for identifying new mechanisms and functionalities for wave manipulation.

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  • Received 19 March 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.214302

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Interdisciplinary Physics

Authors & Affiliations

Xu Wang1, Xinsheng Fang1, Dongxing Mao1, Yun Jing2,*, and Yong Li1,3,†

  • 1Institute of Acoustics, Tongji University, Shanghai 200092, China
  • 2Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA
  • 3College of Architecture and Urban Planning, Tongji University, Shanghai 200092, China

  • *yjing2@ncsu.edu
  • yongli@tongji.edu.cn

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Issue

Vol. 123, Iss. 21 — 22 November 2019

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