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Proceedings Paper

Research on the NO gas-sensitive effect of long-period fiber gratings coated with film
Author(s): Yong Peng; Min Sun
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Paper Abstract

The spectral characteristics of long period fiber grating (LPFG) coated with sensitive film whose refractive index is higher than that of cladding is analyzed based on four-layer-step geometrical model both theoretically and experimentally. It is pointed out that the resonant wavelength of LPFG has a regular variation with the refractive indices of both ambience and the film besides film thickness. Blue shift appears due to the increase of film thickness. Optimal film thickness corresponding to the maximum values of both sensitivity and the change rate of resonant wavelength merely depends on ambient refractive index when the refractive index of the film is a constant. According to above theories, the new LPFG sensors sensitive to refractive index of chemical medium with higher sensitivities and wider range of application will be designed. Five LPFG sensors with different film thicknesses have been prepared by coating 2-6 layers SiO2-WO3 nanoscale multiforamen films on five claddings of LPFG respectively. When we put them in NO with 2% volume fraction, some changes happened only on the LPFG coated with three layers, whose resonant peak red shift 4.77nm, the loss change from -9.93db to -8.53db, the gas sensitivity, response time and recovery time also reached to 3%, 10s and 20s respectively.

Paper Details

Date Published: 12 March 2008
PDF: 7 pages
Proc. SPIE 6624, International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing, 662406 (12 March 2008); doi: 10.1117/12.791057
Show Author Affiliations
Yong Peng, Dalian Univ. of Technology (China)
Dalian Maritime Univ. (China)
Min Sun, Dalian Univ. of Technology (China)
Dalian Maritime Univ. (China)


Published in SPIE Proceedings Vol. 6624:
International Symposium on Photoelectronic Detection and Imaging 2007: Optoelectronic System Design, Manufacturing, and Testing

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