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Journal of Nanophotonics

Photonic crystal filters for multi-band optical filtering on a monolithic substrate
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Paper Abstract

Many applications require the ability to image a scene in several different narrow spectral bands simultaneously. Conventional multi-layer dielectric filters require control of film thickness to change the resonant wavelength. This makes it difficult to fabricate a mosaic of multiple narrow spectral band transmission filters monolithically. We adjusted the spectral transmission of a multi-layer dielectric filter by drilling a periodic array of subwavelength holes through the stack. Multi-band photonic crystal filters were modeled and optimized for a specific case of filtering six optical bands on a single substrate. Numerical simulations showed that there exists a particular air hole periodicity which maximizes the minimum hole diameter. Specifically for a stack of SiO2 and Si3N4 with the set of filtered wavelengths (nm): 560, 576, 600, 630, 650, and 660, the optimal hole periodicity was 282 nm. This resulted in a minimum hole diameter of 90 nm and a maximum diameter of 226 nm. Realistic fabrication tolerances were considered such as dielectric layer thickness and refractive index fluctuations, as well as vertical air hole taper. Our results provide a reproducible methodology for similar multi-band monolithic filters in either the optical or infrared regimes.

Paper Details

Date Published: 1 March 2009
PDF: 11 pages
J. Nanophoton. 3(1) 031506 doi: 10.1117/1.3110223
Published in: Journal of Nanophotonics Volume 3, Issue 1
Show Author Affiliations
Gary Shambat, Stanford Univ. (United States)
Mark S. Mirotznik, The Catholic Univ. of America (United States)
Gary W. Euliss, MITRE Corp. (United States)
Viktor Smolski, The Univ. of North Carolina at Charlotte (United States)
Eric G. Johnson, National Science Foundation (United States)
Ravindra A. Athale, MITRE Corp. (United States)

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