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

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

2008-09-23

arxiv.org/abs/0809.3855v1

Opt. Commun. 281, 5335 (2008)

Physics

Optics

Scientific paper

10.1016/j.optcom.2008.07.073

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 (~760 nm) can be reduced by at least a factor of 10^2, making a path length of 1 mm feasible. By using this technique, optical gas detection can potentially be made possible in microsystems.

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