Demonstration of a highly efficient topological vertical coupler

Demonstration of a highly efficient topological vertical coupler

A defect structure is proposed for enhancing the coupling efficiency of vertically incident circularly polarized light in a topological waveguide. In the topological edge-state waveguide based on triangle lattices of hexagons consisting of six nanoholes respecting C 6v symmetry in a silicon optical...

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Veröffentlicht in:Optics express 2023-10, Vol.31 (21), p.35218-35224
Hauptverfasser: Okada, Sho, Kagami, Hibiki, Nishiyama, Nobuhiko, Hu, Xiao, Amemiya, Tomohiro
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container_end_page 35224
container_issue 21
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container_title Optics express
container_volume 31
creator Okada, Sho
Kagami, Hibiki
Nishiyama, Nobuhiko
Hu, Xiao
Amemiya, Tomohiro
description A defect structure is proposed for enhancing the coupling efficiency of vertically incident circularly polarized light in a topological waveguide. In the topological edge-state waveguide based on triangle lattices of hexagons consisting of six nanoholes respecting C 6v symmetry in a silicon optical circuit, the vertical coupling rate is improved by removing the nanoholes from one hexagonal cell near the line. The coupling efficiency was evaluated with and without the defect structure. The introduced defect structure operates suitably for focused beams of left- and right-handed circularly polarized light, enhancing the optical communication wavelength bandwidth by up to 10 dB.
doi_str_mv 10.1364/OE.500091
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title Demonstration of a highly efficient topological vertical coupler
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