Improvement in the performance of evanescent wave chemical sensors by special waveguide structures

George Stewart; Brian Culshaw; Douglas F. Clark; Ivan Andonovic

doi:10.1117/12.24793

1 March 1991 Improvement in the performance of evanescent wave chemical sensors by special waveguide structures

George Stewart, Brian Culshaw, Douglas F. Clark, Ivan Andonovic

Author Affiliations +

Proceedings Volume 1368, Chemical, Biochemical, and Environmental Fiber Sensors II; (1991) https://doi.org/10.1117/12.24793
Event: SPIE Microelectronic Interconnect and Integrated Processing Symposium, 1990, San Jose, United States

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.

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George Stewart, Brian Culshaw, Douglas F. Clark, and Ivan Andonovic "Improvement in the performance of evanescent wave chemical sensors by special waveguide structures", Proc. SPIE 1368, Chemical, Biochemical, and Environmental Fiber Sensors II, (1 March 1991); https://doi.org/10.1117/12.24793

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