Reflected continuously tunable acoustic metasurface with rotatable space coiling-up structure

具有可旋转各向异性三组分谐振器的连续可调声学超表面

Continuously Tunable Acoustic Metasurface with Rotatable Anisotropic Three-component Resonators

提出一种由可旋转各向异性三组分谐振器构成的连续可调声学超表面，利用偶极共振的偏振方向作为新自由度实现低频相位操控，并实现水下的宽角度宽带声聚焦。

Space-coiling Acoustic Metasurface with Independent Modulations of Phase and Amplitude

In this work, we propose a design of acoustic meta-surfaces in sub-wavelength scale enabling independent modulations of phase and amplitude. Each unit cell of the acoustic meta-surface consists of simple conventional space-coiling structure added with an air layer, which can be analyzed as two equivalent slabs with non-dispersion effective parameters. The amplitude depends on the space-coiling structure regardless of the air layer, and the phase can be further adjusted by the air layer independent to the amplitude. The acoustic meta-surface covers an entire phase change of 2-pi and amplitude c…

All-angle Negative Reflection with An Ultrathin Acoustic Gradient Metasurface: Floquet-Bloch Modes Perspective and Experimental Verification

Metasurface with gradient phase response offers new alternative for steering the propagation of waves. Conventional Snell's law has been revised by taking the contribution of local phase gradient into account. However, the requirement of momentum matching along the metasurface sets its nontrivial beam manipulation functionality within a limited-angle incidence. In this work, we theoretically and experimentally demonstrate that the acoustic gradient metasurface supports the negative reflection for all-angle incidence. The mode expansion theory is developed to help understand how the gradient me…

可调非对称声吸收在通风元表面中

Tunable Asymmetric Acoustic Absorption in Ventilated Metasurfaces

本文提出一种可调高效非对称通风声学系统，通过异质谐振器实现强非对称性，达到99%吸收和98%反射，并通过旋转实现声学开关功能。