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Proceedings Paper

Chemical sensing using Langmuir-Blodgett waveguide overlays on single-mode optical fibers
Author(s): Damian Flannery; Stephen W. James; Ralph P. Tatam; Geoffrey J. Ashwell; David W. Allen; Xing Li
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Paper Abstract

A new design of fiber optic chemical sensor is proposed and demonstrated as a working pH sensor. The sensor is based on the evanescent coupling between a side polished single mode optical fiber and a single mode overlay planar waveguide. The stringent tolerances placed on the planar waveguide thickness are met by depositing the overlay, one molecular layer at a time, by Langmuir-Blodgett (LB) deposition. The advantages of being able to design the optical properties of the organic dye material is demonstrated by comparing two different overlay material and their responses over different wavelength ranges. Finally, a Kramers-Kronig based model, relating the absorption spectrum of the overlay material to its material dispersion, is shown to be able to predict the sensor response.

Paper Details

Date Published: 30 May 1997
PDF: 10 pages
Proc. SPIE 3105, Chemical, Biochemical and Environmental Fiber Sensors IX, (30 May 1997); doi: 10.1117/12.276146
Show Author Affiliations
Damian Flannery, Cranfield Univ. (United Kingdom)
Stephen W. James, Cranfield Univ. (United Kingdom)
Ralph P. Tatam, Cranfield Univ. (United Kingdom)
Geoffrey J. Ashwell, Cranfield Univ. (United Kingdom)
David W. Allen, Sheffield Hallam Univ. (United States)
Xing Li, Sheffield Hallam Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 3105:
Chemical, Biochemical and Environmental Fiber Sensors IX
Robert A. Lieberman, Editor(s)

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