Probing molecular absorption under slow light propagation using a photonic crystal waveguide

Isabelle Dicaire; Alfredo De Rossi; Sylvain Combrié; Luc Thévenaz

doi:10.1117/12.975004

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17 October 2012 Probing molecular absorption under slow light propagation using a photonic crystal waveguide

Isabelle Dicaire, Alfredo De Rossi, Sylvain Combrié, Luc Thévenaz

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Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84211K (2012) https://doi.org/10.1117/12.975004
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

High-resolution infrared absorption spectroscopy of acetylene gas is demonstrated in dispersion-engineered photonic crystal waveguides under slow light propagation. Individual absorption profiles are obtained for both TE and TM polarizations for group indices ranging from 1.5 to 6.7. Experimental enhancement factors of 0.31 and 1.00 are obtained for TE and TM polarization, respectively, and are confirmed by time-domain simulations. We experimentally demonstrate that molecular absorption is a function of the electric field distribution outside the photonic crystal slab and the group index under structural slow-light illumination.

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Isabelle Dicaire, Alfredo De Rossi, Sylvain Combrié, and Luc Thévenaz "Probing molecular absorption under slow light propagation using a photonic crystal waveguide", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84211K (17 October 2012); https://doi.org/10.1117/12.975004

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