Now showing items 1-20 of 23

    • Absolute Absorption Cross-Section Measurement of a Submonolayer film on a silica microresonator 

      Barnes, Jack A.; Gagliardi, Gianluca; Loock, Hans-Peter (2016-02-24)
      Conventional absorption spectroscopy is not nearly sensitive enough for quantitative overtone measurements on submonolayer coatings. While cavity-enhanced absorption detection methods using microresonators have the potential ...
    • Absorption Detection Using Optical Waveguide Cavities 

      Loock, Hans-Peter; Barnes, Jack A.; Gagliardi, Gianluca; Runkai Li, Runkai; Oleschuk, Richard; Wächter, Helen (2016-03-18)
      Cavity ring-down spectroscopy is a spectroscopic method that uses a high quality optical cavity to amplify the optical loss due to the light absorption by a sample. In this presentation we highlight two applications of ...
    • Absorption Measurements in Liquid Core Waveguides Using Cavity 

      Bescherer, Klaus; Barnes, Jack A.; Loock, Hans-Peter (2016-03-07)
      Short liquid core waveguides (LCWs) were included into a fiber-loop cavity ring-down absorption spectrometer to reduce the detection limit over, both, single pass absorption in a LCW and cavityenhanced absorption using a ...
    • Absorption Measurements in Microfluidic Devices Using Ring-Down Spectroscopy 

      Trefiak, Nicholas R.; Barnes, Jack A.; Rask, Fiona; Courtney, Daniel G.; Walford, Richard; Li, Runkai; Oleschuk, Richard; Loock, Hans-Peter (2016-03-29)
      When monitoring separation events in microfluidic devices, one frequently needs to detect small amounts of analyte in picolitre sized volumes with a time response of milliseconds. Fluorescence detection is typically the ...
    • Cavity-Enhanced Photoacoustic Detection Using Acoustic and Fiber-Optic Resonators 

      MacLean, Amy G; Schneider, Leila Tamina; Freytag, Annica I.; Gribble, Adam; Barnes, Jack A.; Loock, Hans-Peter (2016-03-02)
      A wineglass has been used as an acoustic resonator to enhance the photoacoustic signal generated by laser excitation of absorbing dyes in solution. The amplitude of the acoustic signal was recorded using a fiber-optic ...
    • Chemical Sensing Using a Polymer Coated Long-Period Fiber Grating Interrogated by Ring-Down Spectroscopy 

      Barnes, Jack A.; Brown, Robert Stanley; Cheung, A.H.; Dreher, Marian; Mackey, G.; Loock, Hans-Peter (2016-03-15)
      An etched long-period grating was used as a refractive index sensor for vapours of four volatile organic compounds, i.e. m-xylene, cyclohexane, trichloroethylene and commercial gasoline. The sensitivity to the vapours was ...
    • 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 ...
    • Chemical Sensor Based on a Long-Period Fibre Grating Modified by a Functionalized Polydimethylsiloxane Coating 

      Barnes, Jack A.; Dreher, Marian; Plett, Krista; Brown, R. Stephen; Crudden, M. Cathleen; Loock, Hans-Peter (2016-07-05)
      A chemical sensor based on a coated long-period grating has been prepared and characterized. Designer coatings based on polydimethylsiloxane were prepared by the incorporation of diphenylsiloxane and titanium cross-linker ...
    • A Fabry-Perot Refractometer for Chemical Vapor Sensing by Solid-Phase Microextraction 

      St-Gelais, R.; Mackey, G.; Saunders, J.; Zhou, J.; Leblanc-Hotte, A.; Poulin, A.; Barnes, Jack A.; Loock, Hans-Peter; Brown, Robert Stanley; Peter, Yves-Alain (2016-03-14)
      The contour lithography method [1] is used to improve the fabrication yield of previously demonstrated [2] microfluidic Fabry-Perot (FP) refractive index (RI) sensors. The sensors are then coated with polydimethylsiloxane ...
    • Fluorescence Excitation–Emission Matrix (EEM) Spectroscopy and Cavity Ring-Down (CRD) Absorption Spectroscopy of Oil-Contaminated Jet Fuel Using Fiber-Optic Probes 

      Omrani, Hengameh; Barnes, Jack A.; Dudelzak, Alexander E.; Loock, Hans-Peter; Waechtera, Helen (2016-03-11)
      Excitation emission matrix (EEM) and cavity ring-down (CRD) spectral signatures have been used to detect and quantitatively assess contamination of jet fuels with aero-turbine lubricating oil. The EEM spectrometer has been ...
    • Gas Sensing Using Polymer-Functionalized Deformable Fabry–Perot Interferometers 

      St-Gelais, Raphael; Peter, Yves-Alain; Mackey, Gillian; Saunders, John; Zhou, Jingjing; Leblanc-Hotte, Antoine; Poulin, Alexandre; Barnes, Jack A.; Loock, Hans-Peter; Brown, R. Stephen (2016-03-03)
      We report a chemical vapor sensor in which polymer swelling, upon analyte absorption, is used to deform an on-chip silicon Fabry–Perot interferometer (FPI). The magnitude of the deformation, recorded through the resonance ...
    • Long-Period Gratings in Chemical Sensing 

      Barnes, Jack A.; Brown, R. Stephen; Cipot-Wechsler, Judy; Crudden, M. Cathleen; Du, Jenny; Loock, Hans-Peter; Plett, Krista (2016-03-21)
      A chemical sensor system consisting of a coated long period grating, which was spliced into a fiber loop cavity, has been prepared and characterized. Designer coatings based on polydimethylsiloxane and nanostructured ...
    • Loss Determination in Microsphere Resonators by Phase-Shift Cavity Ring-Down Measurements 

      Barnes, Jack A.; Carver, B.; Fraser, James M.; Gagliardi, G.; Loock, Hans-Peter; Tian, Zhaobing; Wilson, M.W.B.; Yam, Scott S.-H.; Yastrubshak, O. (2016-03-21)
      The optical loss of whispering gallery modes of resonantly excited microresonator spheres is determined by optical lifetime measurements. The phase-shift cavity ring-down technique is used to extract ring-down times and ...
    • 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 ...
    • Musical Instrument Pickup Based on a Laser Locked to an Optical Fiber Resonator 

      Avino, Saverio; Barnes, Jack A.; Gagliardi, Gianluca; Gu, Xijia; Gutstein, David; Mester, James R.; Nicholaou, Costa; Loock, Hans-Peter (2016-03-11)
      A low-noise transducer based on a fiber Fabry-Perot (FFP) cavity was used as a pickup for an acoustic guitar. A distributed feedback (DFB) laser was locked to a 25 MHz-wide resonance of the FFP cavity using the Pound-Drever-Hall ...
    • Near Infrared Absorption Detection in Picolitre Liquid Volumes Using Fiber Loop Ring-Down Detection 

      Andrews, Nicholas L. P.; Litman, Jessica; Stroh, Daniel; Barnes, Jack A.; Loock, Hans-Peter (2016-03-07)
      Cavity ring-down spectroscopy is performed using a single-mode fibre loop as an optical cavity. The loop contains absorption cells for either liquids or gases, as well as an erbium-doped fibre amplifier. The fibre amplifier ...
    • Optical Fiber Sensing Based on Reflection Laser Spectroscopy 

      Gagliardi, G.; Salza, M.; Ferraro, P.; Chehura, E.; Tatam, R.P.; Gangopadhyay, T.K.; Ballard, Nicholas; Paz-Soldan, Daniel; Barnes, Jack A.; Loock, Hans-Peter; Lam, T.T.; Chow, J.H.; De Natale, Paolo (2016-03-22)
      An overview on high-resolution and fast interrogation of optical-fiber sensors relying on laser reflection spectroscopy is given. Fiber Bragg-gratings (FBGs) and FBG resonators built in fibers of different types are used ...
    • Phase-Shift Cavity Ring-Down Spectroscopy on a Microsphere Resonator by Rayleigh Backscattering 

      Barnes, Jack A.; Gagliardi, Gianluca; Loock, Hans-Peter (2016-03-04)
      The optical ring-down time in a silica microsphere resonator is measured using phase-shift cavity ring-down spectroscopy. When detecting Rayleigh backscattered light that is coupled into the input waveguide it is found ...
    • Photonic Guitar Pick-up: Fiber Strain Sensors Find Applications in Music Recording 

      Barnes, Jack A.; Gagliardi, Gianluca; Loock, Hans-Peter (2016-03-07)
      In this report we give a summary of our work on the development of low-noise fiber-optic strain sensors. Three types of strain sensors were developed and were tested by attaching them to the bodies of acoustic guitars. The ...
    • Quantification of Different Water Species in Acetone using a NIR-Triple-Wavelength Fiber Laser 

      Andrews, Nicholas L. P.; MacLean, Amy G.; Saunders, John E.; Barnes, Jack A.; Loock, Hans-Peter; Saad, Mohammed; Jia, Chenglai; Ramaswamy, Kishor; Chen, Lawrence R. (2016-02-25)
      A fiber laser using a thulium-doped ZBLAN gain medium was used to generate laser radiation simultaneously at 1461, 1505 and 1874 nm, with > 5 mW output power at each of the wavelengths. The laser was used to quantify the ...