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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
1994-12.
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| Subjects: | |
| Online Access: | Get fulltext |
| LEADER | 01308 am a22001573u 4500 | ||
|---|---|---|---|
| 001 | 78255 | ||
| 042 | |a dc | ||
| 100 | 1 | 0 | |a Gnewuch, H. |e author |
| 700 | 1 | 0 | |a Hua, P. |e author |
| 700 | 1 | 0 | |a Wilkinson, J.S. |e author |
| 700 | 1 | 0 | |a Jansen, K. |e author |
| 245 | 0 | 0 | |a Cross-sectional transformers for the signal-enhancement of intensity-based evanescent field sensors |
| 260 | |c 1994-12. | ||
| 856 | |z Get fulltext |u https://eprints.soton.ac.uk/78255/1/792.pdf | ||
| 520 | |a 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. | ||
| 655 | 7 | |a Article | |