• Chemical Sensing Using Fiber Cavity Ring-Down Spectroscopy 

      Waechter, Helen; Litman, Jessica; Cheung, Adrienne H.; Barnes, Jack A.; Loock, Hans-Peter (2016-03-18)
      Waveguide-based cavity ring-down spectroscopy (CRD) can be used for quantitative measurements of chemical concentrations in small amounts of liquid, in gases or in films. The change in ring-down time can be correlated to ...
    • Detection of Lead Contamination of Water and VOC Contamination of Air Using SOI Micro-Optical Devices 

      Saunders, J.; Dreher, Marian; Crudden, M. Cathleen; Du, J.; Loock, Hans-Peter; Xu, D.X; Densmore, A.; Ma, R.; Janz, S.; Vachon, M.; Lapointe, J.; Delâge, A.; Schmid, J.; Cheben, P. (2016-03-17)
      Micro-photonic SOI Mach-Zehnder interferometers were coated with solid-phase micro-extraction materials derived from polydimethylsiloxane to enable sensing of volatile organic compounds of the BTEX class in air. A different ...
    • Monitoring of Vapor Uptake by Refractive Index and Thickness Measurements in Thin Films 

      Chen, Weijian; Saunders, John E.; Barnes, Jack A.; Yam, Scott S.-H.; Loock, Hans-Peter (2016-03-04)
      We report a method for real-time monitoring of vapor uptake by simultaneous detection of the refractive index, 𝑛 , and thickness, 𝑑 , of thin transparent films with a precision of 𝛿𝑛=10 −4 and 𝛿𝑑<100  nm . The setup ...