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Journal of Sensors
Volume 2009, Article ID 747803, 11 pages
http://dx.doi.org/10.1155/2009/747803
Review Article

Highly Sensitive Sensors Based on Photonic Crystal Fiber Modal Interferometers

1Institut de Ciencies Fotoniques, (ICFO) Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain
2Institució Catalana de Recerca i Estudis Avançats, (ICREA) 08010 Barcelona, Spain

Received 23 March 2009; Accepted 19 May 2009

Academic Editor: Christos Riziotis

Copyright © 2009 Joel Villatoro et al. 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.

Abstract

We review the research on photonic crystal fiber modal interferometers with emphasis placed on the characteristics that make them attractive for different sensing applications. The fabrication of such interferometers is carried out with different post-processing techniques such as grating inscription, tapering or cleaving, and splicing. In general photonic crystal fiber interferometers exhibit low thermal sensitivity while their applications range from sensing strain or temperature to refractive index and volatile organic compounds.