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

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/OE.456898· OSTI ID:1875728

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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0019140
OSTI ID:
1875728
Journal Information:
Optics Express, Journal Name: Optics Express Vol. 30 Journal Issue: 15; ISSN 1094-4087
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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