Absorption detection using optical waveguide cavities

Year: 2010

Authors: Loock H-P., Barnes J. A., Gagliardi G., Li R., Oleschuk R. D., Wächter H.

Autors Affiliation: Department of Chemistry, Queen’s University, Kingston, ON, K7L 3N6, Canada; Consiglio Nazionale Delle Ricerche-Istituto Nazionale Di Ottica (INO), Via Campi Flegrei 34, Pozzuoli, Naples 80078, Italy

Abstract: 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 phase-shift cavity ring-down spectroscopy that are suited for absorption measurements in the condensed phase and make use of waveguide cavities. In the first application, a fiber loop is used as an optical cavity and the sample is introduced in a gap in the loop to allow absorption measurements of nanoliters of solution at the micromolar level. A second application involves silica microspheres as high finesse cavities. Information on the refractive index and absorption of a thin film of ethylene diamine on the surface of the microresonator is obtained simultaneously by the measurements of the wavelength shift of the cavity mode spectrum and the change in optical decay time, respectively.


Volume: 88 (5)      Pages from: 401  to: 410

More Information: Funding for this work was provided by Queen\’s University, the Province of Ontario (Premier\’s Research Excellence Award, Photonics Research Ontario, Ontario Centres of Excellence), Canada (Natural Sciences and Engineering Research Council, Canadian Institute for Photonic Innovations), the Consiglio Nazionale delle Ricerche (CNR), Italy, and from industrial partners (Eli-Lilly Canada, PARTEQ Innovations, ITF Labs, Avensys Labs). GG acknowledges financial support by CNR RSTL project and Italian Ministry of Education, University and Research PON project. Finally, HPL thanks MDS Sciex for sponsoring the W.A.E. McBryde Medal and for their support of analytical chemistry research in Canada.
KeyWords: Absorption measurements; Cavity mode; Cavity ring-down spectroscopy; Condensed phase; Ethylene diamine; Fiber loops; High quality; High-finesse cavity; Micro resonators; Micromolar level; Microresonator; Nanoliters; Optical cavities; Optical decay; Silica microspheres; Spectroscopic method; Waveguide cavity; Wavelength shift, Absorption; Ethylene; Light measurement; Microspheres; Refractive index; Resonators; Silica; Spectroscopic analysis; Waveguides; Absorption spectroscopy
DOI: 10.1139/V10-006

Citations: 8
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