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Proceedings Paper

Chemical microanalysis with cavity-enhanced optical waveguide devices
Author(s): 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
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Paper 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.

Paper Details

Date Published: 17 February 2012
PDF: 13 pages
Proc. SPIE 8332, Photonics and Optoelectronics Meetings (POEM) 2011: Optoelectronic Sensing and Imaging, 833204 (17 February 2012); doi: 10.1117/12.920231
Show Author Affiliations
Hans-Peter Loock, Queen's Univ. (Canada)
Jack A. Barnes, Queen's Univ. (Canada)
Klaus Bescherer, Queen's Univ. (Canada)
Andrew Brzezinski, Queen's Univ. (Canada)
Gianluca Gagliardi, Istituto Nazionale di Ottica-CNR (Italy)
Adam Gribble, Queen's Univ. (Canada)
Siegfried Janz, National Research Council (Canada)
Rubin Ma, National Research Council (Canada)
Dorit Munzke, Queen's Univ. (Canada)
Grant Ongo, Queen's Univ. (Canada)
John Saunders, Queen's Univ. (Canada)
Helen Waechter, Queen's Univ. (Canada)
Dan-Xia Xu, National Research Council (Canada)

Published in SPIE Proceedings Vol. 8332:
Photonics and Optoelectronics Meetings (POEM) 2011: Optoelectronic Sensing and Imaging
Pierre Galarneau; Xu Liu; Pengcheng Li, Editor(s)

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