Journal
OPTICS LETTERS
Volume 39, Issue 4, Pages 969-972Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.39.000969
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Funding
- Office of Naval Research (ONR)
- ONR
- National Research Council (NRC)
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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. (C) 2014 Optical Society of America
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