基于相位调控的超高透射声学超表面及其应用

Phase-controlled acoustic metasurface with high efficiency and its applications

声学超表面可以灵活有效地对声波进行调控,实现多种新颖的现象和功能,在诸多声波调控领域有潜在的应用前景。该文引入了一种镀膜型迷宫结构单元,可以提供全范围(0~2π)的突变相位,具有高效的透射率(~100%)和较好的鲁棒性。基于相位调控,可利用镀膜型迷宫结构单元构建出超高透射超表面,实现异常声折射、声聚焦、声束沿任意凸轨迹弯曲传播以及声成像等应用。

Acoustic metasurfaces can control sound waves flexibly and effectively,and realize a variety of novel phenomena and functions,which makes it show a great application prospect in many acoustic wave control fields.In the paper,authors introduce a coated labyrinthine structure(CLS),which can provide a full phase-controlled range(0~2π)and a high transmittance(~100%),and features a good robustness.Based on the CLS units authors construct the phase-controlled acoustic metasurfaces with high efficiency.Based on the constructed metasurfaces,authors realize the applications of phase control such as acoustic anomalous refraction,acoustic focusing,acoustic beam bending along any convex trajectory,and acoustic imaging.