Chemical Sensing By Evanescent Field Absorption: The Sensitivity Of Optical Waveguides.

G. Stewart; J. Norris; D. Clark; M. Tribble; I. Andonovic; B. Culshaw

doi:10.1117/12.959993

19 January 1989 Chemical Sensing By Evanescent Field Absorption: The Sensitivity Of Optical Waveguides.

G. Stewart, J. Norris, D. Clark, M. Tribble, I. Andonovic, B. Culshaw

Proceedings Volume 0990, Chemical, Biochemical, and Environmental Applications of Fibers; (1989) https://doi.org/10.1117/12.959993
Event: O-E/Fiber LASE '88, 1988, Boston, MA, United States

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.

Citation Download Citation

G. Stewart, J. Norris, D. Clark, M. Tribble, I. Andonovic, and B. Culshaw "Chemical Sensing By Evanescent Field Absorption: The Sensitivity Of Optical Waveguides.", Proc. SPIE 0990, Chemical, Biochemical, and Environmental Applications of Fibers, (19 January 1989); https://doi.org/10.1117/12.959993

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