30 May 2016 Ammonia sensing using lossy mode resonances in a tapered optical fibre coated with porphyrin-incorporated titanium dioxide
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Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99161H (2016) https://doi.org/10.1117/12.2236926
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland
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.
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Divya Tiwari, Divya Tiwari, Kevin Mullaney, Kevin Mullaney, Serhiy Korposh, Serhiy Korposh, Stephen W. James, Stephen W. James, Seung-Woo Lee, Seung-Woo Lee, Ralph P. Tatam, Ralph P. Tatam, } "Ammonia sensing using lossy mode resonances in a tapered optical fibre coated with porphyrin-incorporated titanium dioxide", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99161H (30 May 2016); doi: 10.1117/12.2236926; https://doi.org/10.1117/12.2236926
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