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Proceedings Paper

Ammonia sensing using lossy mode resonances in a tapered optical fibre coated with porphyrin-incorporated titanium dioxide
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Paper Abstract

The development of an ammonia sensor, formed by the deposition of a functionalised titanium dioxide film onto a tapered optical fibre is presented. The titanium dioxide coating allows the coupling of light from the fundamental core mode to a lossy mode supported by the coating, thus creating lossy mode resonance (LMR) in the transmission spectrum. The porphyrin compound that was used to functionalise the coating was removed from the titanium dioxide coating upon exposure to ammonia, causing a change in the refractive index of the coating and a concomitant shift in the central wavelength of the lossy mode resonance. Concentrations of ammonia as small as 1ppm was detected with a response time of less than 1min.

Paper Details

Date Published: 30 May 2016
PDF: 4 pages
Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99161H (30 May 2016); doi: 10.1117/12.2236926
Show Author Affiliations
Divya Tiwari, Cranfield Univ. (United Kingdom)
Kevin Mullaney, Cranfield Univ. (United Kingdom)
Serhiy Korposh, The Univ. of Nottingham (United Kingdom)
Stephen W. James, Cranfield Univ. (United Kingdom)
Seung-Woo Lee, Kitakyushu Univ. (Japan)
Ralph P. Tatam, Cranfield Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 9916:
Sixth European Workshop on Optical Fibre Sensors
Elfed Lewis, Editor(s)

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