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|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.|
|Appears in Collections:||Staff publications - School of Engineering|
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