Extremely Asymmetrical Acoustic Metasurface Mirror at the Exceptional Point

Xu Wang, Xinsheng Fang, Dongxing Mao, Yun Jing, Yong Li

Research output: Contribution to journalArticlepeer-review

107 Scopus citations


Previous research has attempted to minimize the influence of loss in reflection- A nd 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.

Original languageEnglish (US)
Article number214302
JournalPhysical review letters
Issue number21
StatePublished - Nov 22 2019

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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