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Please use this identifier to cite or link to this item: http://dspace.lib.cranfield.ac.uk/handle/1826/5454

Document Type: Article
Title: Fiber-optic chemical sensing with Langmuir-Blodgett overlay waveguides
Authors: Flannery, D.
James, Stephen W.
Tatam, Ralph P.
Ashwell, Geoffrey J.
Issue Date: 1999
Citation: Damian Flannery, Stephen W. James, Ralph P. Tatam, and Geoffery J. Ashwell, Fiber-optic chemical sensing with Langmuir-Blodgett overlay waveguides, Applied Optics, Vol. 38, Issue 36, pp. 7370-7374 (1999)
Abstract: Fiber-optic chemical sensing has been demonstrated with a side-polished single- mode optical fiber, evanescently coupled to chemically sensitive Langmuir- Blodgett (LB) overlay waveguides. The sensors exhibit a channel-dropping response centered on a wavelength that is dependent on the thickness and the refractive index of the overlay waveguide. It has been shown that pH-sensitive organic dyes proved to be suitable materials fur the formation of an overlay waveguide whereas LB deposition provides the required thickness control. A theoretical model of the sensor response, based on the Kramers-Kronig relations and phase matching of the guided modes within the optical fiber and overlay waveguide, shows good agreement with experimental results.
URI: http://dx.doi.org/10.1364/AO.38.007370
Appears in Collections:Staff publications - School of Engineering

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