基于传播相位的高聚焦效率涡旋超表面设计

Design of a vortex metalens with high focusing efficiency using propagation phase.

作者信息

Lv Shuyuan, Bai Yuchi, Luo Wenfeng, Meng Fei, Wang Rong

出版信息

Appl Opt. 2022 Jul 20;61(21):6311-6315. doi: 10.1364/AO.464090.

Abstract

Three vortex-focused beams are produced with linearly polarized light along the or axis at a wavelength of 1550 nm. First, a polarization-independent vortex metalens with a topological charge of three and focal length of 3000 nm is designed by selecting cylindrical-shaped elements. This design has a focusing efficiency of 83%. Second, vortex beams with different focal lengths and topological charges are achieved by combining various shapes of structures. Both designs have a focusing efficiency of greater than 92%. The designed metasurface is of great significance to optical communication and radar detection.

摘要

利用波长为1550nm的沿x或y轴方向的线偏振光产生了三束涡旋聚焦光束。首先，通过选择圆柱形元件设计了一种拓扑电荷为3且焦距为3000nm的偏振无关涡旋超透镜。这种设计的聚焦效率为83%。其次，通过组合各种形状的结构实现了具有不同焦距和拓扑电荷的涡旋光束。两种设计的聚焦效率均大于92%。所设计的超表面对光通信和雷达探测具有重要意义。