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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), pp. 165-173.

Record type: Article

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.

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Published date: December 1994

Identifiers

Local EPrints ID: 78255
URI: http://eprints.soton.ac.uk/id/eprint/78255
ISSN: 0925-4005
PURE UUID: 7f574eaa-ef97-4068-8343-3e8c8fb390e9
ORCID for J.S. Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

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Date deposited: 11 Mar 2010
Last modified: 21 Oct 2017 11:28

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Contributors

Author: H. Gnewuch
Author: P. Hua
Author: J.S. Wilkinson ORCID iD
Author: K. Jansen

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