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Characteristics of Resonantly-Guided Modes in Microstructured Optical Fibers
Open AccessReview

Refractive Index Measurement of Liquids Based on Microstructured Optical Fibers

by Susana Silva 1,†, Paulo Roriz 1,2,† and Orlando Frazão 1,3,*,†
1
INESC Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal
2
ISMAI−Instituto Universitário da Maia, Av. Carlos Oliveira Campos−Castelo da Maia, 4475-690 Maia, Portugal
3
Departamento de Física e Astronomia da Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Photonics 2014, 1(4), 516-529; https://doi.org/10.3390/photonics1040516
Received: 31 October 2014 / Revised: 3 December 2014 / Accepted: 3 December 2014 / Published: 8 December 2014
(This article belongs to the Special Issue Photonic Crystal Sensors)
This review is focused on microstructured optical fiber sensors developed in recent years for liquid RI sensing. The review is divided into three parts: the first section introduces a general view of the most relevant refractometric sensors that have been reported over the last thirty years. Section 2 discusses several microstructured optical fiber designs, namely, suspended-core fiber, photonic crystal fiber, large-core air-clad photonic crystal fiber, and others. This part is also divided into two main groups: the interferometric-based and resonance-based configurations. The sensing methods rely either on full/selective filling of the microstructured fiber air holes with a liquid analyte or by simply immersing the sensing fiber into the liquid analyte. The sensitivities and resolutions are tabled at the end of this section followed by a brief discussion of the obtained results. The last section concludes with some remarks about the microstructured fiber-based configurations developed for RI sensing and their potential for future applications. View Full-Text
Keywords: optical fiber sensors; microstructured fibers; refractive index optical fiber sensors; microstructured fibers; refractive index
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Silva, S.; Roriz, P.; Frazão, O. Refractive Index Measurement of Liquids Based on Microstructured Optical Fibers. Photonics 2014, 1, 516-529.

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