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. 2014 Feb 15;39(4):969-72.
doi: 10.1364/OL.39.000969.

Trace gas absorption spectroscopy using functionalized microring resonators

Todd H Stievater, Marcel W Pruessner, Doewon Park, William S Rabinovich, R Andrew McGill, Dmitry A Kozak, Robert Furstenberg, Scott A Holmstrom, Jacob B Khurgin

Trace gas absorption spectroscopy using functionalized microring resonators

Todd H Stievater et al. Opt Lett. .

Abstract

We detect trace gases at parts-per-billion levels using evanescent-field absorption spectroscopy in silicon nitride microring resonators coated with a functionalized sorbent polymer. An analysis of the microring resonance line shapes enables a measurement of the differential absorption spectra for a number of vapor-phase analytes. The spectra are obtained at the near-infrared overtone of OH-stretch resonance, which provides information about the toxicity of the analyte vapor.

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