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Highly efficient vertical coupling to a topological waveguide with defect structure
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DOI：10.1364/OE.432964.png)
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In this study, we propose a defect structure that enhances the vertical coupling efficiency of circularly polarized light incident on topological waveguides consisting of triangle nanoholes with C-6v symmetry arranged in honeycomb lattice. The defect structure was formed by removing triangle nanoholes from a certain hexagonal unit cell around the topological waveguide. As a result of comparing the coupling efficiency with and without the defect structure through three-dimensional finite-difference time-domain analysis, significant improvement in the vertical coupling efficiency was observed over the entire telecom C band (4460%@1530 nm). In addition, it was also found that the wavelength showing maximum coupling efficiency can be controlled over the entire C band by changing the arrangement of the dielectric around the defect structure. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Keyword:
ORBITAL ANGULAR-MOMENTUM
PHOTONIC CRYSTAL NANOCAVITY
SLOW-LIGHT
期刊
IF:
3.3
论文数:
6.1W
被引数:
14.3W
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引用论文
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