TY - JOUR
T1 - Extremely Asymmetrical Acoustic Metasurface Mirror at the Exceptional Point
AU - Wang, Xu
AU - Fang, Xinsheng
AU - Mao, Dongxing
AU - Jing, Yun
AU - Li, Yong
N1 - Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/11/22
Y1 - 2019/11/22
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.123.214302
DO - 10.1103/PhysRevLett.123.214302
M3 - Article
C2 - 31809135
AN - SCOPUS:85075615957
SN - 0031-9007
VL - 123
JO - Physical review letters
JF - Physical review letters
IS - 21
M1 - 214302
ER -