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Published July 18, 2022 | Published + Supplemental Material
Journal Article Open

Amorphous silicon carbide high contrast gratings as highly efficient spectrally selective visible reflectors


We report spectrally selective visible wavelength reflectors using hydrogenated amorphous silicon carbide (a-SiC:H) as a high index contrast material. Beyond 610nm and through the near infrared spectrum, a-SiC:H exhibits very low loss and exhibits an wavelength averaged index of refraction of n = 3.1. Here we design, fabricate, and characterize such visible reflectors using a hexagonal array of a-SiC:H nanopillars as wavelength-selective mirrors with a stop-band of approximately 40 nm full-width at half maximum. The fabricated high contrast grating exhibits reflectivity R >94% at a resonance wavelength of 642nm with a single layer of a-SiC:H nanopillars. The resonance wavelength is tunable by adjusting the geometrical parameters of the a-SiC:H nanopillar array, and we observe a stop-band spectral center shift from 635 nm up to 642 nm. High contrast gratings formed from a-SiC:H nanopillars are a promising platform for various visible wavelength nanophotonics applications.

Additional Information

© 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement. Received 6 Mar 2022; revised 28 Apr 2022; accepted 28 Apr 2022; published 11 Jul 2022. Funding. Office of Science (DE-SC0019140); Space Solar Power Project; National Science Foundation (EEC-1041895). Data availability. Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request. Supplemental document. See Supplement 1 for supporting content. The authors declare no conflicts of interest

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Published - oe-30-15-26787.pdf

Supplemental Material - 5733453.pdf


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August 22, 2023
October 23, 2023