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Fibers 2019, 7(4), 34; https://doi.org/10.3390/fib7040034

A Novel Approach to Realizing Low-Cost Plasmonic Optical Fiber Sensors: Light-Diffusing Fibers Covered by Thin Metal Films

Department of Engineering, University of Campania “L. Vanvitelli”, via Roma n.29, 81031 Aversa, Italy
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Received: 15 March 2019 / Revised: 6 April 2019 / Accepted: 17 April 2019 / Published: 17 April 2019
(This article belongs to the Special Issue Optical Fibers Sensors 2019)
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Abstract

We have investigated, in a numerical and experimental way, a refractive index (RI) sensor based on surface plasmon resonance (SPR) in a silver-coated light-diffusing fiber (LDF). The experimental tests were conducted using water-glycerine mixtures with refractive indices ranging from 1.332 to 1.388. In the considered refractive index range, the experimental results show a sensitivity of the SPR wavelength to the outer medium’s RI ranging from 2600 to 4700 nm/RIU, which is larger than the sensitivity recently reported for a gold-coated LDF sensor (1200 to 4000nm/RIU). The silver-coated sensor is also shown to ensure a higher signal-to-noise ratio (SNR) compared to the gold-coated sensor.
Keywords: light-diffusing fibers (LDF); optical sensors; thin metal films; silver film; surface plasmon resonance (SPR) light-diffusing fibers (LDF); optical sensors; thin metal films; silver film; surface plasmon resonance (SPR)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cennamo, N.; Zeni, L.; Arcadio, F.; Catalano, E.; Minardo, A. A Novel Approach to Realizing Low-Cost Plasmonic Optical Fiber Sensors: Light-Diffusing Fibers Covered by Thin Metal Films. Fibers 2019, 7, 34.

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