ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Multi-channel terahertz focused beam generator based on shared-aperture metasurface |
Jiu-Sheng Li(李九生)† and Yi Chen(陈翊) |
Centre for THz Research, China Jiliang University, Hangzhou 310018, China |
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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.
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Received: 08 May 2023
Revised: 03 June 2023
Accepted manuscript online: 13 June 2023
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PACS:
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42.50.Tx
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(Optical angular momentum and its quantum aspects)
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03.65.Vf
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(Phases: geometric; dynamic or topological)
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07.05.Tp
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(Computer modeling and simulation)
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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
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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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