Silica optical fibers for the development of evanescent-wave chemical sensors

Vlastimil Matejec; Marie Pospisilova; Daniela Berkova; Miroslav Chomat; Milos Hayer

doi:10.1117/12.284722

11 August 1997 Silica optical fibers for the development of evanescent-wave chemical sensors

Vlastimil Matejec, Marie Pospisilova, Daniela Berkova, Miroslav Chomat, Milos Hayer

Proceedings Volume 3200, Third Conference on Photonic Systems for Ecological Monitoring; (1997) https://doi.org/10.1117/12.284722
Event: Third Conference on Photonic Systems for Ecological Monitoring, 1996, Prague, Czech Republic

Abstract

The paper examines the fabrication and properties of silica optical fibers suitable for the development of evanescent- wave fiber-optic sensors. Attention is given to factors increasing the fraction of power transmitted in the evanescent wave. The effects of the refractive-index profile and fiber bending in the evanescent-wave area and their relation to the sensor sensitivity are investigated. A simple thermometer is developed on the basis of these effects. Approaches for the modification of optical properties in the evanescent-wave area are examined. In this part, porous layers prepared by the sol-gel method based on the silicon and titanium alkoxides and standard polysiloxane polymer coatings are described. The sol-gel derived layers are investigated from the point of view of preparing an optical core with a porous part. The possibilities of controlling the refractive index, as well as absorption coefficient of the coatings by immobilizing pH indicators and Cu²⁺-phthalocyanine are shown together with examples of using evanescent-wave sensing structures for the detection of organophosphorous compounds and pH measurements.

Citation Download Citation

Vlastimil Matejec, Marie Pospisilova, Daniela Berkova, Miroslav Chomat, and Milos Hayer "Silica optical fibers for the development of evanescent-wave chemical sensors", Proc. SPIE 3200, Third Conference on Photonic Systems for Ecological Monitoring, (11 August 1997); https://doi.org/10.1117/12.284722

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