Independent control of circularly polarized light with exceptional topological phase coding metasurfaces

Exceptional points, as degenerate points of non-Hermitian parity-time symmetric systems, have many unique physical properties. Due to its flexible control of electromagnetic waves, a metasurface is frequently used in the field of nanophotonics. In this work, we developed a parity-time symmetric meta...

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Bibliographic Details
Published in:Photonics research (Washington, DC) DC), 2024-03, Vol.12 (3), p.534
Main Authors: Li, Yicheng, Wan, Shicheng, Deng, Shaoxuan, Deng, Zhengwei, Lv, Bo, Guan, Chunying, Yang, Jun, Bogdanov, Andrey, Belov, Pavel, Shi, Jinhui
Format: Article
Language:English
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Summary:Exceptional points, as degenerate points of non-Hermitian parity-time symmetric systems, have many unique physical properties. Due to its flexible control of electromagnetic waves, a metasurface is frequently used in the field of nanophotonics. In this work, we developed a parity-time symmetric metasurface and implemented the 2 π topological phase surrounding an exceptional point. Compared with Pancharatnam-Berry phase, the topological phase around an exceptional point can achieve independent regulation of several circular polarization beams. We combined the Pancharatnam-Berry phase with the exceptional topological phase and proposed a composite coding metasurface to achieve reflection decoupling of different circular polarizations. This work provides a design idea for polarimetric coding metasurfaces in the future.
ISSN:2327-9125
2327-9125
DOI:10.1364/PRJ.510300