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

Haley C. Bauser, Morgan D. Foley, Megan E. Phelan, William Weigand, David R. Needell, Zachary C. Holman, Harry A. Atwater

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Pages (from-to)26787-26793
Number of pages7
JournalOptics Express
Volume30
Issue number15
DOIs
StatePublished - Jul 18 2022

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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