Sensing nitrous oxide with QCL-coupled silicon-on-sapphire ring resonators

 
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Smith, Clinton J.
Shankar, Raji
Laderer, Matthew
Frish, Michael B.
Loncar, Marko
Allen, Mark G.
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https://doi.org/10.1364/OE.23.005491
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Smith, Clinton J., Raji Shankar, Matthew Laderer, Michael B. Frish, Marko Loncar, and Mark G. Allen. 2015. “Sensing Nitrous Oxide with QCL-Coupled Silicon-on-Sapphire Ring Resonators.” Optics Express 23 (5): 5491. https://doi.org/10.1364/oe.23.005491.
Abstract
We report the initial evaluation of a mid-infrared QCL-coupled silicon-on-sapphire ring resonator gas sensor. The device probes the N2O 2241.79 cm(-1) optical transition (R23 line) in the nu(3) vibrational band. N2O concentration is deduced using a non-linear least squares fit, based on coupled-mode theory, of the change in ring resonator Q due to gas absorption losses in the evanescent portion of the waveguide optical mode. These early experiments demonstrated response to 5000 ppmv N2O.
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http://nrs.harvard.edu/urn-3:HUL.InstRepos:41461265

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