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Proceedings Paper

Broadband single-mode optical fiber surface plasma wave chemical sensor
Author(s): Andrew J.C. Tubb; Frank P. Payne; Roger Millington; C. R. Lowe
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Paper Abstract

We describe a new design of optical fiber surface plasma wave chemical sensor. The sensor consists of a tapered single mode optical fiber with a thin layer of silver evaporated on to the tapered section. The gradually changing diameter of the fiber along the taper results in a distributed coupling between the guided mode of the fiber and the surface plasma wave. As a result, and in contrast to conventional plasma wave sensors, coupling to the surface plasma wave occurs over a broad spectral range, typically several hundred nm. The device shows good sensitivity to changes in the refractive index of the external environment, with refractive index changes of 10-4 being detectable. The device is compact, simple to make, and has applications as a biochemical or immunosensor.

Paper Details

Date Published: 24 April 1996
PDF: 11 pages
Proc. SPIE 2676, Biomedical Sensing, Imaging, and Tracking Technologies I, (24 April 1996); doi: 10.1117/12.238797
Show Author Affiliations
Andrew J.C. Tubb, Univ. of Cambridge (United Kingdom)
Frank P. Payne, Univ. of Cambridge (United Kingdom)
Roger Millington, Univ. of Cambridge (United Kingdom)
C. R. Lowe, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 2676:
Biomedical Sensing, Imaging, and Tracking Technologies I
Robert A. Lieberman; Halina Podbielska M.D.; Tuan Vo-Dinh, Editor(s)

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