Open AccessZeolite thin film-coated long period fiber grating sensor for measuring trace chemical
Author(s) -
Jian Zhang,
Xiling Tang,
Junhang Dong,
Tao Wei,
Hai Xiao
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.008317
Subject(s) - materials science , refractive index , grating , optics , optical fiber , thin film , fiber optic sensor , infrared , fiber bragg grating , optoelectronics , zeolite , long period fiber grating , fiber , wavelength , dispersion shifted fiber , composite material , nanotechnology , chemistry , biochemistry , catalysis , physics
This paper reports the development of a new zeolite thin film-coated long period fiber grating (LPFG) sensor for direct measurement of trace organic vapors. The sensor was fabricated by growing pure silica MFI-type zeolite thin film on the optical fiber grating by in situ hydrothermal crystallization. The sensor measures chemical vapor concentration by monitoring the molecular adsorption-induced shift of LPFG resonant wavelength (lambda(R)) in near infrared (IR) region. Upon loading analyte molecules, the zeolite's refractive index changes in the close vicinity of the fiber index where the LPFG has a large response to achieve high sensitivity.