Long period grating fibre operating in visible range coated with porphyrin based thin film as an ammonia aqueous sensor

Sandor Erdody; Serhiy Korposh; Seung-Woo Lee; Stephen P. Morgan

doi:10.1117/12.2680215

23 May 2023 Long period grating fibre operating in visible range coated with porphyrin based thin film as an ammonia aqueous sensor

Sandor Erdody, Serhiy Korposh, Seung-Woo Lee, Stephen P. Morgan

Author Affiliations +

Proceedings Volume 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023); 126432R (2023) https://doi.org/10.1117/12.2680215
Event: European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023, Mons, Belgium

Abstract

A long period grating (LPG) operating in the visible wavelength range functionalised with sensitive dyes is reported. Two different sensing mechanisms transmission based, using intensity ratio; and refractive index change based, using the PMTP attenuation bands shift are presented. The visible range LPG’s with phase matching turning point (PMTP) ~700 nm was fabricated using amplitude mask laser inscribing approach on a hydrogen loaded SM600 fibre. Ammonia sensitive thin film based on diazonium resin (DAR) and tetrakis-(4-sulfophenyl)porphine (TSPP) dye was deposited via layer-by-layer deposition on LPG fibre and glass substrate. Glass substrate coated by DAR-TSPP was used to calculate the complex refractive index (RI) difference. The response of the visible LPG was compared to an infrared LPG with a same coating.

Citation Download Citation

Sandor Erdody, Serhiy Korposh, Seung-Woo Lee, and Stephen P. Morgan "Long period grating fibre operating in visible range coated with porphyrin based thin film as an ammonia aqueous sensor", Proc. SPIE 12643, European Workshop on Optical Fibre Sensors (EWOFS 2023), 126432R (23 May 2023); https://doi.org/10.1117/12.2680215

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