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Previous research has attempted to minimize the influence of loss inreflection- and transmission-type acoustic metasurfaces. This letter showsthat, by treating the acoustic metasurface as a non-Hermitian system and byharnessing loss, unconventional wave behaviors that do not exist in losslessmetasurfaces can be uncovered. Specifically, we theoretically andexperimentally demonstrate a non-Hermitian acoustic metasurface mirrorfeaturing extremely asymmetrical reflection at the exception point. As anexample, the metasurface mirror is designed to have high-efficiencyretro-reflection when the wave incidents from one side and complete absorptionwhen the wave incidents from the other side. This work marries conventionalgradient index metasurfaces with the exception point from non-Hermitiansystems, and paves the way for identifying new mechanisms and functionalitiesfor wave manipulation.

Extremely asymmetrical acoustic metasurface mirror at the exceptional point