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Photonic crystal gas sensors

: Wehrspohn, R.B.; Geppert, T.M.; Schweizer, S.L.; Rhein, A. von; Pergande, D.; Beyer, T.; Lambrecht, A.


Voet, M. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
17th International Conference on Optical Fibre Sensors. Vol.1 : 23.-27.Mai 2005 in Brügge/Belgien
Bellingham/Wash.: SPIE, 2005 (SPIE Proceedings Series 5855)
ISBN: 0-8194-5855-4
International Conference on Optical Fibre Sensors <17, 2005, Brügge>
Fraunhofer IPM ()
photonic crystal; sensor application; low group velocity; macro-porous silicon

The bandstructure of photonic crystals offers intriguing possibilities for the manipulation of electromagnetic waves. During the last years, research has mainly focussed on the application of these photonic crystal properties in the telecom area. We suggest utilization of photonic crystals for sensor applications such as qualitative and quantitative gas and liquid analysis. Taking advantage of the low group velocity and certain mode distributions for some k-points in the bandstructure of a photonic crystal should enable the realization of very compact sensor devices. We show different device configurations of a photonic crystal based on macroporous silicon that fulfill the demands to serve as a compact gas sensor.