基于表面等离子体共振的椭圆侧芯光子晶体光纤传感器  

Elliptical side core photonic crystal fiber sensor based on surface plasmon resonance

作　　者：单义婷 赵丽娟[1,2,3] 张智娟 SHAN Yiting;ZHAO Lijuan;ZHANG Zhijuan(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding,Hebei 071003,China;Hebei Key Laboratory of Power Internet of Things Technology,North China Electric Power University,Baoding,Hebei 071003,China;Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology,North China Electric Power University,Baoding,Hebei 071003,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003 [2]华北电力大学河北省电力物联网技术重点实验室,河北保定071003 [3]华北电力大学保定市光纤传感与光通信技术重点实验室,河北保定071003

出　　处：《光电子．激光》2024年第9期903-909,共7页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(62273146,62171185);中央高校基本科研业务费专项资金(2021MS072);河北省自然科学基金(E2019502177,E2020502010);河北省省级科技计划(SZX2020034)资助项目。

摘　　要：为实现低折射率化学材料、药物的高灵敏度监测,基于表面等离子体共振(surface plasmon resonance,SPR)设计了一种具有高灵敏度的新型椭圆侧芯光子晶体光纤(photonic crystal fiber,PCF)传感器。该传感器设计包括圆形孔及三种规格的椭圆孔,左侧椭圆孔内覆盖金纳米薄膜。当光进入传感器时,会在金薄膜处产生共振。分析由此物理现象得到的光谱即可获知待测液体的折射率。采用有限元法系统地研究了椭圆空气孔的椭圆率与金薄膜厚度对所提传感器的灵敏度的影响。研究发现,当待测液体折射率范围为1.41—1.44时,该传感器的最大灵敏度高达95000 nm/RIU(RIU为折射率单位)。在同等折射率测量范围,本研究开发的PCF-SPR传感器灵敏度为典型PCF-SPR传感器的3.7—47.5倍。因此,该PCF-SPR传感器在物质监测、食品安全和生物医学等领域中有较好的应用前景。In order to achieve high-sensitivity monitoring of chemical materials and drugs with low refractive index,a new type of high-sensitivity photonic crystal fiber(PCF)sensor with elliptical side core is designed based on the surface plasmon resonance(SPR).A circular hole and three different sizes of elliptical holes constitute the sensor air hole,and the gold nano film is coated in the left elliptical hole.When light enters the sensor,it will generate resonance at the gold thin film.The refractive index of the liquid to be measured can be obtained by analyzing the spectrum obtained from this physical phenomenon.The finite element method is adopted to systematically investigate the effects of ellipticity of elliptical holes and the thickness of gold thin film on the sensitivity of the proposed sensor.The results reveal that the maximum sensitivity of the sensor reaches 95000 nm/RIU(RIU is refractive index unit)when the refractive index of the liquid to be measured ranges from 1.41 to 1.44.In view of the existing researches,the sensitivity is 3.7—47.5 times of that of typical available PCF-SPR sensors within the same range of refractive index.Therefore,the proposed PCF-SPR sensor can be widely applied in fields,such as material monitoring,food safety,and biomedicine.

关 键 词：光纤光学 传感器 表面等离子体 椭圆率 灵敏度 

分 类 号：O436[机械工程—光学工程]