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Proceedings Paper

Chemical Sensing By Evanescent Field Absorption: The Sensitivity Of Optical Waveguides.
Author(s): G. Stewart; J. Norris; D. Clark; M. Tribble; I. Andonovic; B. Culshaw
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Paper Abstract

The presence of a chemical may be sensed by its effect on the evanescent field of an optical wave; the evanescent field may conveniently be established through use of an optical waveguide. We have applied three techniques to the problem of estimating the sensitivity of a variety of guide structures to the presence of a chemical species. The results for an asymmetric guide show that for a given mode, sensitivity is hinly dependent on the guide thickness. Additionally, the effect of buffer layers (fouling) at the waveguide surface has been examined and results indicate the need for careful control of the surface conditions.

Paper Details

Date Published: 19 January 1989
PDF: 8 pages
Proc. SPIE 0990, Chemical, Biochemical, and Environmental Applications of Fibers, (19 January 1989); doi: 10.1117/12.959993
Show Author Affiliations
G. Stewart, The University of Strathclyde (UK)
J. Norris, U.K. Atomic Energy Authority (UK)
D. Clark, The University of Strathclyde (UK)
M. Tribble, U.K. Atomic Energy Authority (UK)
I. Andonovic, The University of Strathclyde (UK)
B. Culshaw, The University of Strathclyde (UK)

Published in SPIE Proceedings Vol. 0990:
Chemical, Biochemical, and Environmental Applications of Fibers
Robert A. Lieberman; Marek T. Wlodarczyk, Editor(s)

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