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Proceedings Paper

High-visibility photonic crystal fiber interferometer for ultrasensitive refractometric sensing
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Paper Abstract

A simple and compact photonic crystal fiber (PCF) interferometer that operates in reflection mode is proposed for refractive index (RI) sensing. The device consists of a ~12mm-long stub of commercially available PCF (LMA-10) fusion spliced to standard optical fiber (SMF-28). The device reflection spectrum exhibits interference patterns with fringe contrast up to 40 dB. One of the excited modes in the PCF is sensitive to external RI therefore the device can be useful for refractrometry. The shift of the interference pattern can be monitored as a function of the external index. In the operating range, from 1.33 to 1.43, the maximum shift is less than the interferometer period, so there is no-ambiguity in the measurements. The maximum sensitivity and resolution achieved were 735 nm per RI units and 7×10-5, respectively. Another approach to measure the external RI consists of monitoring the reflection power located at the quadrature point of the inference pattern in a properly selected wavelength. Consequently the measuring range is narrower but the resolution is higher, up ~7×10-6, thanks to the high fringe contrast.

Paper Details

Date Published: 25 October 2011
PDF: 7 pages
Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80114K (25 October 2011); doi: 10.1117/12.901942
Show Author Affiliations
Guillermo A. Cárdenas-Sevilla, Ctr. de Investigaciones en Óptica, A.C. (Mexico)
ICFO - Institut de Ciències Fotòniques (Spain)
Fernando C. Fávero, ICFO - Institut de Ciències Fotòniques (Spain)
Pontifícia Univ. Católica do Rio de Janeiro (Brazil)
Vittoria Finazzi, ICFO - Institut de Ciències Fotòniques (Spain)
Joel Villatoro, ICFO - Institut de Ciències Fotòniques (Spain)
Valerio Pruneri, ICFO - Institut de Ciències Fotòniques (Spain)
ICREA - Institució Catalana de Recerca i Estudis Avançats, (Spain)


Published in SPIE Proceedings Vol. 8011:
22nd Congress of the International Commission for Optics: Light for the Development of the World
Ramón Rodríguez-Vera; Ramón Rodríguez-Vera; Ramón Rodríguez-Vera; Rufino Díaz-Uribe; Rufino Díaz-Uribe; Rufino Díaz-Uribe, Editor(s)

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