外涂层对SPR型光子晶体光纤折射率传感的影响研究  

Research on the influence of outer coating on refractive index sensing of SPR photonic crystal fiber

作　　者：姜如珊 张汇一 李青枫 施伟华 JIANG Rushan;ZHANG Huiyi;LI Qingfeng;SHI Weihua(College of Electronic and Optical Engineering&College of Microelectronics,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院、微电子学院,南京210023

出　　处：《光通信技术》2021年第11期18-22,共5页Optical Communication Technology

基　　金：国家自然科学基金项目(61571237)资助;江苏省重点(国家级)大学生创新训练计划项目(SZDG2019013)资助。

摘　　要：为了探究不同外涂层对传感性能的影响,提出一种基于表面等离子体共振(SPR)的光子晶体光纤(PCF)折射率传感结构,在光纤外表面镀有金属膜层。通过有限元方法比较了涂层材料分别为金、银、石墨烯和银+氧化锌时对传感性能的影响。数值研究表明:当结构参数相同时,在1.33~1.38折射率区间,涂层材料为石墨烯的传感结构的灵敏度较高,达7000 nm/RIU,涂层材料为金时灵敏度为5000 nm/RIU,涂层材料为银和银+氧化锌时灵敏度都为4000 nm/RIU;在灵敏度拟合线性度方面,各涂层都具有较高线性度,其中银涂层的线性度最高,为0.99112。In order to explore the influence of different outer coatings on sensing performance,a photonic crystal fiber(PCF)refractive index sensing structure based on surface plasmon resonance(SPR)is designed in this paper,the outer surface of the optical fiber is coated with a metal film.Through finite element method,the effects of coating materials are gold,silver,graphene and silver+zinc oxide on the sensing performance have been compared.Numerical studies show that when the structural parameters are the same,in the refractive index range of 1.33~1.38,the sensitivity of the sensing structure with graphene as coating material is higher,up to 7000 nm/RIU,gold as coating material is 5000 nm/RIU,silver and silver+ZnO as coating material are both 4000 nm/RIU;In terms of sensitivity fitting linearity,each coating has high linearity,and the linearity of silver coating is the highest,which can reach 0.99112.

关 键 词：涂层 折射率传感 光子晶体光纤 灵敏度 线性度 

分 类 号：TN29[电子电信—物理电子学] O436[机械工程—光学工程]