Acoustic metasurfaces are attractive due to the feasibility of unprecedented modulation for reflected or refracted waves. However, most proposed acoustic metasurfaces are planar, which limits the application of metasurfaces. An acoustic metasurface with a curved surface shape is rarely reported, especially for the three-dimensional case. In this paper, the three-dimensional generalized Snell’s law for reflection at an arbitrarily curved surface is derived. Then tunable curved metasurfaces composed of the corrugated holes unit-cells are designed. And anomalous reflection, focusing and ground illusion are numerically demonstrated. The design methodology proposed in this paper expands the application range of acoustic metasurfaces and paves the way to some special application realms, such as wearable acoustic devices and acoustic devices with curved surfaces.

中文翻译：

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用于三维反射波前调制的任意弯曲的声学超表面

由于对反射波或折射波进行空前调制的可行性，声学超表面具有吸引力。然而，大多数提出的声学超颖表面是平面的，这限制了超颖表面的应用。具有曲面形状的声学超表面很少被报道，特别是对于三维情况。本文推导了在任意曲面上反射的三维广义斯涅尔定律。然后设计由波纹孔单元组成的可调曲面超曲面。并数值模拟了异常反射，聚焦和地面错觉。本文提出的设计方法扩展了声学超表面的应用范围，并为某些特殊的应用领域铺平了道路，