Multi-channel terahertz focused beam generator based on shared-aperture metasurface  

作　　者：李九生 陈翊 Jiu-Sheng Li;Yi Chen(Centre for THz Research,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]Centre for THz Research,China Jiliang University,Hangzhou 310018,China

出　　处：《Chinese Physics B》2023年第12期341-347,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No.62271460);the Zhejiang Key Research and Development Project,China (Grant Nos.2021C03153 and 2022C03166)。

摘　　要：Most of existing metasurfaces usually have limited channel behavior,which seriouslyhinders their development and application.In this paper,we propose a multi-channel terahertz focused beam generator based on shared-aperture metasurface,and the generator consists of a top square metal strip,a middle layer of silica and a metal bottom plate.By changing the position and size of the shared-aperture array,the designed metasurface can generate any number of multi-channel focusing beams at different predicted positions.In addition,the energy intensity of focusing beams can be controlled.The full-wave simulation results show that the metasurface achieves four-channel vortex focused beam generation with different topological charges,and five-,six-,eight-channel focused beam generation with different energy intensities at a frequency of 1 THz,which are in good agreement with the theoretically calculated predictions.This work can provide a new idea for designing the terahertz multichannel devices.

关 键 词：terahertz wave MULTI-CHANNEL shared-aperture focused beam 

分 类 号：O431.1[机械工程—光学工程]