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Fibers 2017, 5(1), 1; doi:10.3390/fib5010001

A Fiber Optic Fabry–Perot Cavity Sensor for the Probing of Oily Samples

1
Foundation for Research and Technology-Hellas (FORTH), Institute of Electronic Structure and Laser (IESL), P.O. Box 1385, 71110 Heraklion, Greece
2
Department of Physics, University of Crete, 71003 Heraklion, Greece
*
Author to whom correspondence should be addressed.
Academic Editors: Torsten Frosch and Stephen C. Bondy
Received: 3 September 2016 / Revised: 30 November 2016 / Accepted: 23 December 2016 / Published: 3 January 2017
(This article belongs to the Special Issue Optical Fiber Sensors)
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Abstract

A micro-optical Fabry–Perot cavity fabricated by non-linear laser lithography on the endface of a standard telecom fiber is tested here as a microsensor for identifying oily liquids. The device operates within the 1550 nm spectral region, while the spectra recorded in reflection mode correlate to the refractive index of the oily liquids used, as well as, to the diffusion dynamics in the time domain of the oily samples inside the porous photo-polymerized sensing head. The operation of the microresonator sensing probe is explained by using a three-layer Fabry–Perot model and basic diffusion physics to estimate diffusivities for three series of refractive index matching oils with different chemical compositions that had been used in those experiments. The distinct spectro-temporal response of this sensing probe to the different oil samples is demonstrated and discussed. View Full-Text
Keywords: optical fiber sensors; Fabry–Perot resonators; porous surfaces; oils; diffusion in porous layers; direct laser writing; multi-photon polymerization optical fiber sensors; Fabry–Perot resonators; porous surfaces; oils; diffusion in porous layers; direct laser writing; multi-photon polymerization
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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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Melissinaki, V.; Farsari, M.; Pissadakis, S. A Fiber Optic Fabry–Perot Cavity Sensor for the Probing of Oily Samples. Fibers 2017, 5, 1.

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