Chemical microanalysis with cavity-enhanced optical waveguide devices

Hans-Peter Loock; Jack A. Barnes; Klaus Bescherer; Andrew Brzezinski; Gianluca Gagliardi; Adam Gribble; Siegfried Janz; Rubin Ma; Dorit Munzke; Grant Ongo; John Saunders; Helen Waechter; Dan-Xia Xu

doi:10.1117/12.920231

17 February 2012 Chemical microanalysis with cavity-enhanced optical waveguide devices

Hans-Peter Loock, Jack A. Barnes, Klaus Bescherer, Andrew Brzezinski, Gianluca Gagliardi, Adam Gribble, Siegfried Janz, Rubin Ma, Dorit Munzke, Grant Ongo, John Saunders, Helen Waechter, Dan-Xia Xu

Author Affiliations +

Proceedings Volume 8332, Photonics and Optoelectronics Meetings (POEM) 2011: Optoelectronic Sensing and Imaging; 833204 (2012) https://doi.org/10.1117/12.920231
Event: Photonics and Optoelectronics Meetings 2011, 2011, Wuhan, China

Abstract

Three examples of cavity-enhanced measurements of refractive index and optical absorption are discussed. Using microphotonic silicon-on-insulator ring-resonators we determine the concentration of cyclohexane and m-xylene at detection levels of 300-3000 ppm. The gases are first absorbed into a siloxane polymer and its refractive index change is detected by a characteristic wavelength shift of the cavity resonance. In a second device phase-shift cavity ring-down spectroscopy is applied to simultaneously measure the optical absorption at two wavelengths of either a dye, nucleic acids or a pharmaceutical component. Multiplexing the ring-down measurement permits dual wavelength absorption spectroscopy without the use of a dispersion element. Finally, a combination of resonance wavelength measurements and cavity ring-down spectroscopy is used to simultaneously determine the change in refractive index and the absorption induced by adsorption of ethylene diamine on a 300 μm silica sphere. A whispering gallery mode of the microsphere resonator is excited with intensity modulated light and the intensity and AM modulation phase of the Rayleigh backscattered light is measured.

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Hans-Peter Loock, Jack A. Barnes, Klaus Bescherer, Andrew Brzezinski, Gianluca Gagliardi, Adam Gribble, Siegfried Janz, Rubin Ma, Dorit Munzke, Grant Ongo, John Saunders, Helen Waechter, and Dan-Xia Xu "Chemical microanalysis with cavity-enhanced optical waveguide devices", Proc. SPIE 8332, Photonics and Optoelectronics Meetings (POEM) 2011: Optoelectronic Sensing and Imaging, 833204 (17 February 2012); https://doi.org/10.1117/12.920231

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