Photonic bandgap infrared spectrometer
Date
2010
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Source Title
Applied Optics
Print ISSN
1559-128X
Electronic ISSN
0003-6935
Publisher
Optical Society of America
Volume
49
Issue
18
Pages
3596 - 3600
Language
English
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Abstract
We propose and demonstrate an infrared (IR) absorption spectrometer, made with a spatially variable photonic bandgap (PBG) structure, a blackbody source, and a simple IR detector, to identify the IR molecular fingerprints of analyte molecules. The PBG-based structure consists of thermally evaporated, IR transparent, high-refractive-index chalcogenide quarter-wave stacks (QWS) with a cavity layer. Spatial variation of the very sharp transmission peak due to the QWS cavity mode allows the structure to be used as a variable IR filter. Our proposed IR-PBG spectrometer can be used for detection and identification of volatile organic compounds.
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Keywords
Energy gap , Spectrometers , Spontaneous emission , Volatile organic compounds , Absorption spectrometers , Analyte molecules , Blackbody sources , Cavity layers , Cavity mode , IR detector , IR filters , Molecular fingerprint , Photonic band-gap structures , Quarter wave stacks , Spatial variations , Transmission peaks , Spectrometry