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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 7 — Apr. 7, 2014
  • pp: 8012–8023

A long period grating-based chemical sensor insensitive to the influence of interfering parameters

Stephen W. James, Serhiy Korposh, Seung-Woo Lee, and Ralph P. Tatam  »View Author Affiliations


Optics Express, Vol. 22, Issue 7, pp. 8012-8023 (2014)
http://dx.doi.org/10.1364/OE.22.008012


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Abstract

An optical fibre chemical sensor that is insensitive to interfering parameters including temperature and surrounding refractive index is described. The sensor is based upon a Mach-Zehnder interferometer formed by a pair of identical cascaded long period gratings (LPGs), with the entire device coated with a mesoporous coating of silica nanoparticles. A functional material is infused only into the coating over the section of optical fibre separating the LPGs. The transmission spectrum of the device consists of a channeled spectrum arising from interference of the core and cladding modes within the envelope of the LPG resonance band. Parameters such as temperature, strain and surrounding refractive perturb the entire device, causing the phase of the channeled spectrum and the central wavelength of the envelope shift at the same rate. Exposure of the device to the analyte of interest perturbs only the optical characteristics of the section of fibre into which the functional material was infused, thus influencing only the phase of the channeled spectrum. Measurement of the phase of the channeled spectrum relative to the central wavelength of the envelope allows the monitoring of the concentration of the analyte with no interference from other parameters.

© 2014 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(280.1545) Remote sensing and sensors : Chemical analysis
(160.4236) Materials : Nanomaterials

ToC Category:
Sensors

History
Original Manuscript: January 30, 2014
Revised Manuscript: February 28, 2014
Manuscript Accepted: March 4, 2014
Published: March 28, 2014

Citation
Stephen W. James, Serhiy Korposh, Seung-Woo Lee, and Ralph P. Tatam, "A long period grating-based chemical sensor insensitive to the influence of interfering parameters," Opt. Express 22, 8012-8023 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-7-8012


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References

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