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TiO2 coated tapered optical fiber SPR sensor for alcohol sensing application

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Abstract

In this article, we propose and theoretically analyze a tapered single mode fiber (SMF) based surface plasmon resonance (SPR) sensor for its application in alcohol sensing. Plasmons are generated at the surface of the silver (Ag) film, where the free electrons of metal excited by the fundamental propagating mode of light traveling in the fiber core. A thin film of titanium dioxide (TiO2) over metal is employed to protect the Ag from environmental chemical reactions as well as to improve the sensor’s sensitivity. The numerical investigations have been performed using the COMSOL Multiphysics software based finite element method (FEM) simulation tool. Simulation results provide the maximum wavelength and amplitude sensitivity of 3250 nm/RIU (refractive index unit) and 1891 RIU−1, respectively. At the same time, the sensor's average RI and alcohol sensitivities are 2350 nm/RIU and 0.886 nm/% with excellent linearity were obtained in the 1.33–1.38 RI and 0–60% alcohol concentration range. Along with that, the sensor found a reasonable resolution of 3.07 \(\times \) 10–5 RIU as well as figure of merit of 195 RIU−1 and 0.008 detection accuracy. The enhanced sensing performance, simple structure, and low cost make it prospective device to be potentially utilized in the chemical, biomedical, food safety, and defense applications.

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Acknowledgements

Authors are very thankful to IIT(ISM) Dhanbad, India, for providing the facilities to conduct the research related works.

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  1. Department of Physics, Indian Institute of Technology (ISM), Dhanbad, 826004, India

    Maya Chauhan & Vinod Kumar Singh

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  1. Maya Chauhan
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Correspondence to Vinod Kumar Singh.

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Chauhan, M., Singh, V.K. TiO2 coated tapered optical fiber SPR sensor for alcohol sensing application. J Opt 52, 2285–2295 (2023). https://doi.org/10.1007/s12596-023-01131-y

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