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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.
[1] Liang W, Huang Y Y, Xu Y, Lee R K, Yariv A 2005 Applied Physics Letters 86 151122
[2] Chryssis A N, Lee S M, Lee S B, Saini S, Dagenais M 2005 IEEE Photonics Technology Letters 17 1253
[3] [4] [5] Tong L M, Gattass R R, Ashcom J B, He S L, Lou J Y, Shen M Y, Maxwell I, Mazur E 2003 Nature 426 816
[6] Xu F, Brambilla G, Lu Y Q 2009 Opt. Express 17 20866
[7] [8] Fang X, Liao C R, Wang D N 2010 Opt. Letters 35 1007
[9] [10] Tong L M, Lou J Y, Mazur E 2004 Opt. Express 12 1025
[11] [12] [13] Zhang Z J 2009 Theory Foundation of Fiber Grating and Sensing Technology (Beijing:Science Press) p49 (in Chinese) [张自嘉 2009 光纤光栅理论基础与传感技术(北京:科技出版社)第49页]
[14] [15] Zhang Y, Lin B, Tjin S C, Zhang H, Wang G H, Shum P, Zhang X L 2010 Opt. Express 18 26345
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[1] Liang W, Huang Y Y, Xu Y, Lee R K, Yariv A 2005 Applied Physics Letters 86 151122
[2] Chryssis A N, Lee S M, Lee S B, Saini S, Dagenais M 2005 IEEE Photonics Technology Letters 17 1253
[3] [4] [5] Tong L M, Gattass R R, Ashcom J B, He S L, Lou J Y, Shen M Y, Maxwell I, Mazur E 2003 Nature 426 816
[6] Xu F, Brambilla G, Lu Y Q 2009 Opt. Express 17 20866
[7] [8] Fang X, Liao C R, Wang D N 2010 Opt. Letters 35 1007
[9] [10] Tong L M, Lou J Y, Mazur E 2004 Opt. Express 12 1025
[11] [12] [13] Zhang Z J 2009 Theory Foundation of Fiber Grating and Sensing Technology (Beijing:Science Press) p49 (in Chinese) [张自嘉 2009 光纤光栅理论基础与传感技术(北京:科技出版社)第49页]
[14] [15] Zhang Y, Lin B, Tjin S C, Zhang H, Wang G H, Shum P, Zhang X L 2010 Opt. Express 18 26345
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