D型高双折射光子晶体光纤的折射率传感特性研究  

Refractive Index Sensing Characteristics of D-shaped High Birefringent Photonic Crystal Fiber

作　　者：伍铁生 杨祖宁 张慧仙 刘智慧 杨丹 钟旭 刘岩 刘锐[1] WU Tiesheng;YANG Zuning;ZHANG Huixia;LIU Zhihui;YANG Dan;ZHONG Xu;LIU Yan;LIU Rui(Guangxi Key Laboratory of Wireless Broadband Communication and Signal Processing,College of Information and Communication,Guilin University of ELectronic Technology,Guilin,Guangxi 541004,China;Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education,College of Optoelectronic Engineering,Shenzhen University,Shenzhen,Guangdong 518060,China;Guangdong and Hong Kong Joint Research Centre for Optical Fiber Sensors,College of Optoelectronic Engineering,Shenzhen University,Shenzhen,Guangdong 518060,China)

机构地区：[1]桂林电子科技大学信息与通信学院,广西无线宽带通信与信号处理重点实验室,广西桂林541004 [2]深圳大学光电工程学院光电子器件与系统教育部重点实验室,广东深圳518060 [3]深圳大学光电工程学院,广东省光纤传感技术粤港联合研究中心,广东深圳518060

出　　处：《光子学报》2022年第3期196-205,共10页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61805051);广西自然科学基金(Nos.2018JJB170035,2018AD19071,2019GXNSFFA245002,2020JJA170047);广西无线宽带通信与信号处理重点实验室主任基金(Nos.GXKL06190118,GXKL0616102,GXKL06180203,GXKL06180104)。

摘　　要：基于表面等离子体共振(SPR)原理,分析了D型高双折射光子晶体光纤(HB-PCF)的折射率传感特性。模拟研究了抛磨角度对双折射、折射率传感灵敏度的影响。仿真结果表明:当抛磨面离纤芯的高度小于1.5倍占空比时,抛磨面离纤芯越近,双折射越小;随着抛磨角度的增加,双折射先增加后减小,折射率传感灵敏度随之减小;当抛磨角度为0°且折射率范围在1.330~1.390时,D型HB-PCF的平均折射率灵敏度高达2833.33 nm/RIU。此外,制备了一种D型高双折射率光子晶体光纤SPR传感器,实验测得其折射率灵敏度约为1711.83 nm/RIU。D型HB-PCF SPR传感器可应用于生物、化学和环境监测等领域。Surface Plasmon Resonance(SPR)is a physical phenomenon,when the frequency and wave number of incident light coincide with the frequency of free electrons vibrating on the metal surface,then the electrons(i.e.,plasma)on the metal surface absorb light energy and resonate,and its resonance wavelength changes with the refractive index of the precious metal surface,so SPR has a wide range of application needs in medical detection,environmental monitoring and other fields.Based on the principle of SPR,this work investigates the refractive index sensing characteristics of D-type highly birefringent photonic crystal fibers in detail.The current reports on PCF SPR sensors are mainly based on the establishment of theoretical models and numerical simulations.It is difficult to experimentally prepare PCF SPR sensors.According to the high birefringence photonic crystal fiber used in the experiment,the photonic crystal fiber of the simulation model is composed of five layers of air holes.The first layer of the cladding contains 2.2μm,the diameter of the large air hole is 4.5μm,and the polishing depth is represented by h,that is,the distance from the core of the photonic crystal fiber to the polishing surface,and the angle between the slow axis of the high birefringence photonic crystal fiber and the polishing surface is defined as the polishing directionθ.The gold film is coated on the flat polishing surface of the optical fiber to facilitate contact with the object to be measured.According to previous theoretical and experimental research,we set the thickness(t)of the gold film to 45 nm.The refractive index of the photonic crystal fiber background material and the refractive index of gold used in the simulation are given by the experimental data of linear interpolation.In order to obtain the waveguide mode of the side-polished highbirefringent photonic crystal fiber,this paper uses the finite element method commercial software COMSOL Multiphysics and sets the boundary conditions of the perfect matching layer for simulation

关 键 词：光子晶体光纤 表面等离子体共振 折射率 传感器 侧边抛磨 

分 类 号：TN253[电子电信—物理电子学]