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Proceedings Paper

Improvement in the performance of evanescent wave chemical sensors by special waveguide structures
Author(s): George Stewart; Brian Culshaw; Douglas F. Clark; Ivan Andonovic
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Paper Abstract

Evanescent wave sensors based on single mode waveguides are attractive but have rather low sensitivities for gaseous species and suffer degradation from surface contaminants. We propose the use of a thin high-index loading film on a silica waveguide to enhance the field strength at the guide surface and to correct measurements for surface contamination by launching the two polarisation modes. Resonant structures also enhance sensitivities when matched to the absorption characteristics of a gas.

Paper Details

Date Published: 1 March 1991
PDF: 9 pages
Proc. SPIE 1368, Chemical, Biochemical, and Environmental Fiber Sensors II, (1 March 1991); doi: 10.1117/12.24793
Show Author Affiliations
George Stewart, Univ. of Strathclyde (United Kingdom)
Brian Culshaw, Univ. of Strathclyde (United Kingdom)
Douglas F. Clark, Univ. of Strathclyde (United Kingdom)
Ivan Andonovic, Univ. of Strathclyde (United Kingdom)

Published in SPIE Proceedings Vol. 1368:
Chemical, Biochemical, and Environmental Fiber Sensors II
Robert A. Lieberman; Marek T. Wlodarczyk, Editor(s)

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