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Proceedings Paper

Long-period gratings in chemical sensing
Author(s): Jack A. Barnes; R. Stephen Brown; Judy Cipot-Wechsler; Cathleen M. Crudden; Jenny Du; Hans-Peter Loock; Krista Plett
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Paper Abstract

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 organically modified silica (ORMOSIL) materials were prepared to provide enhanced sensitivity for a variety of key environmental pollutants. Upon microextraction of the analyte into the polymer matrix, an increase in the refractive index of the coating resulted in a change of the attenuation spectrum of the long period grating. The grating was interrogated using ring-down detection as a means to amplify the optical loss and to gain stability against misalignment and laser power fluctuations. Chemical differentiation of cyclohexane and xylenes was achieved and a detection limit of 300 ppm of xylenes vapour in air was readily realized for PDMS coatings. Ormosil-type coatings were capable of detecting lead cations at concentrations below 1 ppm in water.

Paper Details

Date Published: 12 August 2008
PDF: 8 pages
Proc. SPIE 7099, Photonics North 2008, 70992C (12 August 2008); doi: 10.1117/12.806722
Show Author Affiliations
Jack A. Barnes, Queen's Univ. (Canada)
R. Stephen Brown, Queen's Univ. (Canada)
Judy Cipot-Wechsler, Queen's Univ. (Canada)
Cathleen M. Crudden, Queen's Univ. (Canada)
Jenny Du, Queen's Univ. (Canada)
Hans-Peter Loock, Queen's Univ. (Canada)
Krista Plett, Queen's Univ. (Canada)


Published in SPIE Proceedings Vol. 7099:
Photonics North 2008

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