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Proceedings Paper

On-chip broadband spectral filtering using planar double high-contrast grating reflectors
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Paper Abstract

We propose a broadband free-space on-chip spectrometer based on an array of integrated narrowband filters consisting of Fabry-Perot resonators formed by two high-contrast grating (HCG) based reflectors separated by a low-index thin layer with a fixed cavity thickness. Using numerical simulations, broadband tunability of resonance wavelengths was achieved only by changing the in-plane grating parameters such as period or duty cycle of HCGs while the substrate geometry was kept fixed. Experimentally, the HCG reflectors were fabricated on silicon on insulator (SOI) substrates and high reflectivity was measured, fabrication process for the proposed double HCG-based narrowband filter array was developed. The filtering function that can be spanned over a wide range of wavelengths was measured.

Paper Details

Date Published: 27 February 2015
PDF: 6 pages
Proc. SPIE 9372, High Contrast Metastructures IV, 93720O (27 February 2015); doi: 10.1117/12.2080451
Show Author Affiliations
Yu Horie, California Institute of Technology (United States)
Amir Arbabi, California Institute of Technology (United States)
Andrei Faraon, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 9372:
High Contrast Metastructures IV
Connie J. Chang-Hasnain; David Fattal; Fumio Koyama; Weimin Zhou, Editor(s)

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