Cross-sectional transformers for the signal-enhancement of intensity-based evanescent field sensors
Cross-sectional transformers for the signal-enhancement of intensity-based evanescent field sensors
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.
165-173
Gnewuch, H.
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Hua, P.
92fa76e2-970b-45f5-a459-d9f95e735303
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Jansen, K.
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December 1994
Gnewuch, H.
bb752678-6981-4d39-adc7-db6efde25d33
Hua, P.
92fa76e2-970b-45f5-a459-d9f95e735303
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Jansen, K.
468cd7bf-61f1-4428-b8a6-984447f8417a
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), .
(doi:10.1016/0925-4005(94)87017-9).
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
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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 02:32
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Author:
H. Gnewuch
Author:
P. Hua
Author:
K. Jansen
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