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Miniature infrared gas sensors using photonic crystals

: Lambrecht, A.; Hartwig, S.; Schweizer, S.L.; Wehrspohn, R.B.

Preprint urn:nbn:de:0011-n-600910 (1.5 MByte PDF)
MD5 Fingerprint: 94bdd1e9e7e9c73b0098f6764b778e51
Copyright 2007 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Erstellt am: 13.7.2010

Adibi, A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Photonic crystal materials and devices VI : 22 - 25 January 2007, San Jose, California, USA
Bellingham, WA: SPIE, 2007 (Proceedings of SPIE 6480)
ISBN: 978-0-8194-6593-1
Paper 64800D
Conference "Photonic Crystal Materials and Devices" <6, 2007, San Jose/Calif.>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IPM ()
photonic crystal; gas sensor; infrared; macro-porous silicon

The sensitivity of an infrared gas sensor depends on the interaction length between radiation and gas, i.e. a reduction in cell size generally results in a reduced sensitivity, too. However, low group velocity regions in the bandstructure of photonic crystals should enable the realization of very compact gas sensors. Using photonic crystals based on macroporous silicon experimental results with CO2 show an increase of the gas sensitivity in the photonic crystal compared to an empty cell of same dimensions. For practical applications the results are compared with gas measurements using conventional multireflection cells and hollow fiber setups.