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

doi:10.1088/1674-1056/acddd2

Abstract 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.

Keywords: terahertz wave multi-channel shared-aperture focused beam

Received: 08 May 2023
Revised: 03 June 2023
Accepted manuscript online: 13 June 2023

PACS:	42.50.Tx	(Optical angular momentum and its quantum aspects)
	03.65.Vf	(Phases: geometric; dynamic or topological)
	07.05.Tp	(Computer modeling and simulation)

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

Corresponding Authors: Jiu-Sheng Li
E-mail: lijsh2008@126.com

Cite this article:

Jiu-Sheng Li(李九生) and Yi Chen(陈翊) Multi-channel terahertz focused beam generator based on shared-aperture metasurface 2023 Chin. Phys. B 32 124204

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

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