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.
© 2014 Optical Society of America
Original Manuscript: November 27, 2013
Revised Manuscript: January 7, 2014
Manuscript Accepted: January 8, 2014
Published: February 11, 2014
Todd H. Stievater, Marcel W. Pruessner, Doewon Park, William S. Rabinovich, R. Andrew McGill, Dmitry A. Kozak, Robert Furstenberg, Scott A. Holmstrom, and Jacob B. Khurgin, "Trace gas absorption spectroscopy using functionalized microring resonators," Opt. Lett. 39, 969-972 (2014)