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The Scientific World Journal
Volume 2013 (2013), Article ID 913418, 14 pages
Review Article

A Review of Refractometric Sensors Based on Long Period Fibre Gratings

G. Rego1,2

1Escola Superior de Tecnologia e Gestão, Instituto Politécnico de Viana do Castelo, Avenida do Atlântico, 4900-348 Viana do Castelo, Portugal
2UOSE, INESC-Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal

Received 20 August 2013; Accepted 25 September 2013

Academic Editors: C. Gao and I. Latka

Copyright © 2013 G. Rego. 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.


In the last decade refractometric sensors have attracted an increasing interest by the scientific community due to their ability to perform ambient monitoring, to assess food quality and safety, and also to the fact that they enable the development of label free sensors in the biomedical area. These advances result, namely, from the use of long period fibre gratings in the turning points and/or with thin films in the transition region that allows resolutions of 10−6 to changes in the refractive index of the surrounding medium. Resolutions exceeding 10−8 can also be achieved when long period fibre gratings are combined with evanescent field based devices. This paper reviews the recent path towards the development of ultrahigh sensitive optical fibre refractometric sensors.