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

Divya Tiwari; Kevin Mullaney; Serhiy Korposh; Stephen W. James; Seung-Woo Lee; Ralph P. Tatam

doi:10.1117/12.2236926

30 May 2016 Ammonia sensing using lossy mode resonances in a tapered optical fibre coated with porphyrin-incorporated titanium dioxide

Divya Tiwari, Kevin Mullaney, Serhiy Korposh, Stephen W. James, Seung-Woo Lee, Ralph P. Tatam

Author Affiliations +

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.

Citation Download Citation

Divya Tiwari, Kevin Mullaney, Serhiy Korposh, Stephen W. James, Seung-Woo Lee, and 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); https://doi.org/10.1117/12.2236926

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