Special Section on Nanostructured Thin Films

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

[+] Author Affiliations
Gary Shambat

Stanford University, Department of Electronic Engineering, Stanford, CA 94305

Mark S. Mirotznik

Electrical Engineering, The Catholic University of America, 620 Michigan Ave, NE, Washington, DC 20064

Gary Euliss

Emerging Technologies Office, MITRE Corporation, 7515 Colshire Drive, McClean, VA 22102-7508

Viktor O. Smolski, Eric G. Johnson

Department of Electrical and Computer Engineering, University of North Carolina at Charlotte, Charlotte, NC 28223

Ravi A. Athale

Emerging Technologies Office, MITRE Corporation, 7515 Colshire Drive, McClean, VA 22102-7508

J. Nanophoton. 3(1), 031506 (March 10, 2009). doi:10.1117/1.3110223
History: Received October 28, 2008; Revised February 20, 2009; Accepted February 26, 2009; March 10, 2009; Online March 10, 2009
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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.

© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Gary Shambat ; Mark S. Mirotznik ; Gary Euliss ; Viktor O. Smolski ; Eric G. Johnson, et al.
"Photonic crystal filters for multi-band optical filtering on a monolithic substrate", J. Nanophoton. 3(1), 031506 (March 10, 2009). ; http://dx.doi.org/10.1117/1.3110223


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