Single-layer terahertz metasurface for multichannel vortex device based on polarization multiplexing

FangXu Zhao; Peng Dong; Ming Zhang

doi:10.1117/12.3035964

20 November 2024 Single-layer terahertz metasurface for multichannel vortex device based on polarization multiplexing

FangXu Zhao, Peng Dong, Ming Zhang

Proceedings Volume 13244, Nano-optoelectronics and Micro/Nano-photonics X; 132440U (2024) https://doi.org/10.1117/12.3035964
Event: SPIE/COS Photonics Asia, 2024, Nantong, Jiangsu, China

Conference Poster

Abstract

Orbital angular momentum (OAM) beams are special beams with helical phase distribution. The conventional methods for generating OAM beams primarily rely on devices such as spiral phase plates, cascaded lens, and spatial light modulators. However, these methods incur high costs and face challenges in meeting the demands for optical system miniaturization and integration. The appearance of metasurface provides a new platform for the generation of integrated OAM beams. In order to achieve low crosstalk multi-channel OAM multiplexing on a single-layer metasurface, this work researches the phase and amplitude characteristics of co-polarization and cross-polarization in the transmission phase generation process. In addition, under the normal irradiation of circularly polarized light, three OAM beams carrying different topological charges are successfully generated by adjusting the structural parameters and rotation angles of the unit. The proposed terahertz metasurface demonstrates the ability to control complex wavefronts and offers a new avenue for developing multi-channel terahertz metasurfaces.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

FangXu Zhao, Peng Dong, and Ming Zhang "Single-layer terahertz metasurface for multichannel vortex device based on polarization multiplexing", Proc. SPIE 13244, Nano-optoelectronics and Micro/Nano-photonics X, 132440U (20 November 2024); https://doi.org/10.1117/12.3035964

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