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Proceedings Paper

Numerical analysis and experimental investigation of highly sensitive photonic crystal fiber long-period grating refractive index sensor
Author(s): Zonghu He; Yinian Zhu; Jiří Kaňka; Henry Du
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Paper Abstract

In this paper, we present the numerical analyses of modal coupling properties and resonance spectral response of longperiod gratings (LPGs) in solid-core photonic crystal fibers (PCFs) with respect to their sensitivity to refractive indices of measurands in the air channels using a full-vectoral mode solver combined with frequency-domain method. The calculated results show that the wavelength resonance of a PCF-LPG can be extremely sensitive to the refractive index change. The PCF-LPG refractive index sensors, inscribed by residual stress relaxation using a scanning CO2 laser, are also experimentally investigated in terms of resonance shift with the PCF-LPG structure filled with sodium chloride (NaCl) solutions at concentrations ranging from 0-26% (w/w). The spectral features were greatly improved by inscribing the LPG structure in PCF prefilled with water. The PCF-LPG sensors are shown to be able to detect the change of ~10-7 refractive index unit (RIU) in the index range of 1.33 to 1.35, in a good agreement with the numerical simulation.

Paper Details

Date Published: 12 October 2007
PDF: 8 pages
Proc. SPIE 6767, Photonic Crystals and Photonic Crystal Fibers for Sensing Applications III, 67670E (12 October 2007); doi: 10.1117/12.734568
Show Author Affiliations
Zonghu He, Stevens Institute of Technology (United States)
Yinian Zhu, Stevens Institute of Technology (United States)
Jiří Kaňka, Institute of Photonics and Electronics (Czech Republic)
Henry Du, Stevens Institute of Technology (United States)

Published in SPIE Proceedings Vol. 6767:
Photonic Crystals and Photonic Crystal Fibers for Sensing Applications III
Henry H. Du; Hiroshi Fudouzi, Editor(s)

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