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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
Journal Article, Electronic Publication
Fraunhofer IPM ()

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.