Open AccessTheoretical investigation on refractive index sensor basedon Bragg grating in micro/nanofiber
Author(s) -
Renrong Liang,
Qi Sun,
Jianghai Wo,
Deming Liu
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.104221
Subject(s) - materials science , fiber bragg grating , refractive index , cladding (metalworking) , optics , optical fiber , optoelectronics , normalized frequency (unit) , grating , fiber optic sensor , sensitivity (control systems) , wavelength , fabrication , physics , medicine , phase locked loop , alternative medicine , pathology , electronic engineering , frequency synthesizer , phase noise , metallurgy , engineering
Subwavelength and nanometer diameter optical fibers have the optical property of enhanced evanescent fields, which makes them very sensitive to the index change of the ambient medium. In this paper, a novel refractometric sensor based on fiber Bragg grating in micro/nano-fiber (MNFBG) is proposed, integrating the enhanced evanescent fields of micro/nano-fiber (MNF) with wavelength choice feature of FBG, and the fabrication about MNFBG is discussed. Refractive index sensing characteristics is comprehensively investigated in theories, and the simulation of sensing the variation of ambient refractive index is performed by using the software of OptiGrating. Results show the sensitivity of the MNFBG is increasing with the decrease of the radium of the MNF. MNFBG with the radius of 400nm can achieve the sensitivity as high as 993nm/RIU. This value is enhanced by 170 times over that of the FBG with etched cladding, which demonstrates that MNFBG has great potential of application in miniaturized, high-sensitivity refractometric sensors.