中国物理B ›› 2023, Vol. 32 ›› Issue (12): 124204-124204.doi: 10.1088/1674-1056/acddd2
Jiu-Sheng Li(李九生)† and Yi Chen(陈翊)
Jiu-Sheng Li(李九生)† and Yi Chen(陈翊)
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.
中图分类号: (Optical angular momentum and its quantum aspects)