Long-Period Gratings in Chemical Sensing

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Authors

Barnes, Jack A.
Brown, R. Stephen
Cipot-Wechsler, Judy
Crudden, M. Cathleen
Du, Jenny
Loock, Hans-Peter
Plett, Krista

Date

2016-03-21

Type

journal article

Language

en

Keyword

Long-Period Grating (LPG) , Solid-Phase Microextraction (SPME) , Chemical Sensor , Cavity Ring-Down (CRD) , Fiber-Loop Ring-Down (FLRD) , Mesoporous Silica (SBA-15) , Mesoporous Silicate

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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.

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0277-786X

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