论文部分内容阅读
亚波长直径微纳光纤强倏逝场传输的光学特性,使其对周围介质折射率的变化具有极高的灵敏度.本文提出一种基于微纳尺度光纤布拉格光栅(MNFBG)的折射率传感器,结合微纳光纤倏逝场传输和光纤布拉格光栅(FBG)强波长选择的特性来实现高精度折射率传感,对其制备可行性进行了讨论.论文中对MNFBG折射率传感机理进行了深入的理论分析,并使用OptiGrating软件进行了数值模拟,模拟数据显示MNFBG折射率测量的灵敏度随着光纤半径的减小而增加,其中光纤半径为400nm的MNFBG灵敏度可达到993nm/RIU,相比于包层蚀刻的FBG灵敏度增加了170倍,说明MNFBG对发展微型化、高灵敏度折射率传感器具有良好的应用前景.
The optical properties of subwavelength micro / nanofiber intense evanescent field transmission make it have very high sensitivity to the change of refractive index of the surrounding medium.This paper presents a refractive index sensor based on micro-scale fiber Bragg grating (MNFBG) Micro-nano optical fiber evanescent field transmission and fiber Bragg grating (FBG) strong wavelength selection characteristics to achieve high-precision refractive index sensing, the feasibility of its preparation is discussed in the paper on the MNFBG refractive index sensing mechanism in-depth The theoretical analysis and numerical simulation using OptiGrating software show that the sensitivity of MNFBG refractive index measurement increases with the decrease of fiber radius. The sensitivity of MNFBG with the fiber radius of 400nm can reach 993nm / RIU, The sensitivity of the etched FBG increased by 170 times, indicating that MNFBG has good application prospects for the development of miniaturized and highly sensitive refractive index sensors.