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Slow-light enhanced light-matter interactions with applications to gas sensing

 
: Jensen, K.H.; Alam, M.N.; Scherer, B.; Lambrecht, A.; Mortensen, N.A.

:
Preprint urn:nbn:de:0011-n-831098 (316 KByte PDF)
MD5 Fingerprint: bf6b324b2265278731318c0d60fb18a9
Created on: 12.11.2008


Optics communications 281 (2008), No.21, pp.5335-5339
ISSN: 0030-4018
English
Journal Article, Electronic Publication
Fraunhofer IPM ()

Abstract
Optical gas detection in microsystems is limited by the short micron scale optical path length available. Recently, the concept of slow-light enhanced absorption has been proposed as a route to compensate for the short path length in miniaturized absorption cells. We extend the previous perturbation theory to the case of a Bragg stack infiltrated by a spectrally strongly dispersive gas with a narrow and distinct absorption peak. We show that considerable signal enhancement is possible. As an example, we consider a Bragg stack consisting of PMMA infiltrated by O2. Here, the required optical path length for visible to near-infrared detection (not, vert, similar760 nm) can be reduced by at least a factor of 102, making a path length of 1 mm feasible. By using this technique, optical gas detection can potentially be made possible in microsystems.

: http://publica.fraunhofer.de/documents/N-83109.html