AMORPHOUS SILICON CARBIDE HIGH CONTRAST GRATINGS AS HIGHLY EFFICIENT SPECTRALLY SELECTIVE VISIBLE REFLECTORS
Version 2 2022-07-11, 13:44
Version 1 2022-07-11, 13:44
Posted on 2022-07-11 - 13:44
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.
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Bauser, Haley; Foley, Morgan; Phelan, Megan; Weigand, William; Needell, David; Holman, Zachary; et al. (2022). AMORPHOUS SILICON CARBIDE HIGH CONTRAST GRATINGS AS HIGHLY EFFICIENT SPECTRALLY SELECTIVE VISIBLE REFLECTORS. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.6034724.v1
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AUTHORS (7)
HB
Haley Bauser
MF
Morgan Foley
MP
Megan Phelan
WW
William Weigand
DN
David Needell
ZH
Zachary Holman
HA
Harry Atwater