Chemical microanalysis with cavity-enhanced optical waveguide devices

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DOIResolve DOI: http://doi.org/10.1117/12.920231
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TypeArticle
Proceedings titleSPIE - International Society for Optical Engineering. Proceedings
ConferencePhotonics and Optoelectronics Meetings (POEM) 2011: Optoelectronic Sensing and Imaging, 2 November 2011 through 5 November 2011, Wuhan
ISSN0277-786X
ISBN9780819489890
Volume8332
Article number833204
SubjectCavity enhanced spectroscopy; cavity ring-down; microphotonics; microsphere resonators; Silicon-on-insulators; waveguide cavity; Adsorption; Ethylene; Light absorption; Microspheres; Nucleic acids; Resonators; Silica; Spectroscopy; Spheres; Wavelength; Refractive index
AbstractThree 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. © 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Microstructural Sciences (IMS-ISM)
Peer reviewedYes
NPARC number21269162
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Record identifier7766e921-7cf2-4b99-9592-e281708eb812
Record created2013-12-12
Record modified2017-04-24
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