All-chalcogenide variable infrared filter
Date
2009
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Abstract
We present the design, fabrication, characterization of spatially variable infrared filter and a demonstration of the filter as a simple infrared spectrometer. A varying photonic band gap filter which consists of thermally evaporated, high refractive index contrast amorphous chalcogenide glass multilayers, makes the structure suitable to be used as spectrometer. Due to graded thickness structure, the filter exhibits a position dependent stop band and a cavity mode ranging from 2 to 8 μm wavelengths. It is demonstrated that the filter can be used to detect absorption peaks of common gases in the cavity mode range of the filter. © 2009 SPIE.
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Proceedings of SPIE
Publisher
SPIE
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Keywords
Hand-held spectrometer, Infrared filter, Omnidirectional photonic band gap, Photonic crystals, Absorption peaks, Amorphous chalcogenide, Cavity mode, Hand-held spectrometer, High refractive index contrasts, Infrared filter, Infrared filters, Omnidirectional photonic band gap, Photonic band gap filters, Stop-bands, Energy gap, Gas absorption, Infrared detectors, Optical devices, Photonic crystals, Refractive index, Spectrometers, Spectrometry, Photonic band gap
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Language
English