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

High-resolution infrared absorption spectroscopy of acetylene gas is demonstrated in a dispersion-engineered photonic crystal waveguide under slow-light propagation. Experimental enhancement factors of 0.31 and 1.00 are obtained for TE and TM polarization, respectively, for group indices ranging from 1.5 to 6.7. The dependence of molecular absorption on the evanescent electric-field distribution and on the group index under structural slow-light illumination is experimentally demonstrated and confirmed by time-domain simulations.


Published in:
Optics Letters, 37, 23, 4934-4936
Year:
2012
ISSN:
1539-4794
Keywords:
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 Record created 2012-12-03, last modified 2018-03-18

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