1 March 2009 Photonic crystal filters for multi-band optical filtering on a monolithic substrate
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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.
Gary Shambat, Mark S. Mirotznik, Gary W. Euliss, Viktor Smolski, Eric G. Johnson, Ravindra A. Athale, "Photonic crystal filters for multi-band optical filtering on a monolithic substrate," Journal of Nanophotonics 3(1), 031506 (1 March 2009). https://doi.org/10.1117/1.3110223 . Submission:
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