近日，苏州大学的徐亚东及其研究小组与南京航空航天大学伏洋洋等人合作并取得一项新进展。经过不懈努力，他们实现用于完美和不对称光束分裂的声学双层梯度超表面。相关研究成果已于2024年1月7日在国际知名学术期刊《中国物理快报》上发表。

该研究团队在实验和理论上提出了一种精确的双层梯度超表面设计范例，用于波束操纵。通过简单地调整层间尺寸，可以产生极不对称的分裂效应。这一概念来源于相梯度超表面中的异常衍射和双层超表面中相梯度的精确结合。

通过设计的双层系统，实验证明，由于来自相反方向的入射光束在动量空间中有不同的衍射路径，可以以鲁棒的方式产生极不对称的声波束分裂。这项研究工作为设计控制波传播的可调谐器件提供了一种新颖的方法和可行的平台。

附：英文原文

Title: Acoustic Bilayer Gradient Metasurfaces for Perfect and Asymmetric Beam Splitting

Author:

Issue&Volume: 2024-01-07

Abstract: We experimentally and theoretically present a paradigm for the accurate bilayer design of gradient metasurfaces for wave beam manipulation, producing an extremely asymmetric splitting effect by simply tailoring the interlayer size. This concept arises from anomalous diffraction in phase gradient metasurfaces and the precise combination of the phase gradient in bilayer metasurfaces. Ensured by different diffraction routes in momentum space for incident beams from opposite directions, extremely asymmetric acoustic beam splitting can be generated in a robust way, as demonstrated in experiments through a designed bilayer system. Our work provides a novel approach and feasible platform for designing tunable devices to control wave propagation.

DOI: 10.1088/0256-307X/41/1/014301

Source: https://cpl.iphy.ac.cn/10.1088/0256-307X/41/1/014301