Cross-sectional transformers for the signal-enhancement of intensity-based evanescent field sensors


Gnewuch, H., Hua, P., Wilkinson, J.S. and Jansen, K. (1994) Cross-sectional transformers for the signal-enhancement of intensity-based evanescent field sensors. Sensors and Actuators B: Chemical, 22, (3), 165-173. (doi:10.1016/0925-4005(94)87017-9).

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Description/Abstract

A cross-sectional transformer (CST) that allows efficient interconnection between a conventional multimode optical fibre and a broad shallow waveguide, designed for strong interaction of guided modes with sensing materials in the evanescent field, is described. A ray approach is used to determine a simple theoretical relationship between the geometrical configuration of the transformer and the enhancement in sensitivity to absorption. Thinly clad rectangular optical fibres have been drawn from a composite preform, and a CST has been fabricated using a suitably formed bundle of these fibres. An enhancement of 3.9±0.6 dB of the power collected from a broad slab waveguide compared with that collected directly by a multimode fibre is measured. The attenuation of the rectangular fibres that comprise the CST is 0.1±10.07 dB /cm at 550 nm.

Item Type: Article
ISSNs: 0925-4005 (print)
1873-3077 (electronic)
Related URLs:
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: University Structure - Pre August 2011 > Optoelectronics Research Centre
ePrint ID: 78255
Date Deposited: 11 Mar 2010
Last Modified: 27 Mar 2014 18:58
URI: http://eprints.soton.ac.uk/id/eprint/78255

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