title: Sensing nitrous oxide with QCL-coupled silicon-on-sapphire ring resonators.
abstract: We report the initial evaluation of a mid-infrared QCL-coupled silicon-on-sapphire ring resonator gas sensor. The device probes the N(2)O 2241.79 cm(-1) optical transition (R23 line) in the ν(3) vibrational band. N(2)O 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 N(2)O.
authors.forename: Clinton J
authors.initials: CJ
authors.lastname: Smith
authors.forename: Raji
authors.initials: R
authors.lastname: Shankar
authors.forename: Matthew
authors.initials: M
authors.lastname: Laderer
authors.forename: Michael B
authors.initials: MB
authors.lastname: Frish
authors.forename: Marko
authors.initials: M
authors.lastname: Loncar
authors.forename: Mark G
authors.initials: MG
authors.lastname: Allen