Step-index multimode fiber cladding surface plasma resonance sensor

Yu-dong SU; Yong WEI; Ping WU; Jiang-xi HU; Chun-lan LIU

doi:10.3788/OPE.20192712.2525

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Step-index multimode fiber cladding surface plasma resonance sensor

Modern Applied Optics | 更新时间：2020-07-09

- Step-index multimode fiber cladding surface plasma resonance sensor
- Optics and Precision Engineering Vol. 27, Issue 12, Pages: 2525-2533(2019)
- 作者机构：
  
  1.重庆三峡学院智能信息处理与控制重庆市高校市级重点实验室，重庆 404100
  2.重庆三峡学院物联网与智能控制技术重庆市工程研究中心，重庆 404100
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20192712.2525
  CLC： TN253
- Received：29 September 2019，
  
  Accepted：16 October 2019，
  
  Published：25 December 2019
- 稿件说明：
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Yu-dong SU, Yong WEI, Ping WU, et al. Step-index multimode fiber cladding surface plasma resonance sensor[J]. Optics and precision engineering, 2019, 27(12): 2525-2533.
DOI：

Yu-dong SU, Yong WEI, Ping WU, et al. Step-index multimode fiber cladding surface plasma resonance sensor[J]. Optics and precision engineering, 2019, 27(12): 2525-2533. DOI： 10.3788/OPE.20192712.2525.

摘要

光纤表面等离子体共振(SPR)传感器通常以纤芯为共振基底，需要采用腐蚀、侧抛、研磨等复杂的加工工艺将光纤包层去除，存在倏逝波不易泄露，传感探针制作困难的问题。本文提出一种以光纤包层为SPR共振基底的阶跃折射率多模光纤包层SPR传感器。采用单模光纤与阶跃折射率多模光纤偏芯熔接结构，将单模光纤纤芯中的光直接注入多模光纤包层，并在阶跃折射率多模光纤包层外镀50 nm金膜。在探针传感段，光场能量全部分布在阶跃折射率多模光纤包层中，发生SPR效应充分。与传统光纤包层SPR传感结构相比，该传感器能够获得更深的共振谷，折射率测量范围为1.333~1.385 RIU时，传感器的平均灵敏度可达2 307 nm/RIU，本文亦对传感段多模光纤纤芯直径与长度不同参数的影响进行了探究。本文提出的阶跃折射率多模光纤包层SPR传感器制作简单，有效解决了光纤包层与空气界面不易获得倏逝波的问题。

Abstract

The optical fiber Surface Plasma Resonance (SPR) sensor is usually based on the fiber core as the resonance substrate. It is necessary to remove the optical fiber cladding by adopting complex processing technologies such as etching

side polishing

grinding

etc. However

there are problems such as evanescent waves that are not easy to leak or sensor probe making them difficult to observe. In this study

a step-index multimode fiber clad SPR sensor with fiber cladding as the SPR resonant substrate is proposed. The transmitted light of a single-mode fiber is injected into step-index multimode fiber cladding by core-shift welding and the 50 nm gold film is plated on the step-index multimode fiber cladding. In the probe sensing section

all the light field energy is distributed in the step-index multimode fiber cladding

the SPR effect is sufficient

and a deeper resonance valley is obtained than by using the conventional fiber cladding SPR sensing structure. When the refractive index measurement range is 1.333—1.385 RIU

the average sensitivity of the sensor can reach 2 307 nm/RIU. This study also explores the influence of different parameters on the diameter and length of the multimode fiber core in the sensing section. The step-index multimode fiber cladding SPR sensor proposed in this study is simple to fabricate and can effectively solve the evanescent wave problem making information difficult to obtain between fiber cladding and air interface.

关键词

Keywords

references

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Key Laboratory of Optical Fiber Sensing and Communications （Education Ministry of China）， University of Electronic Science and Technology of China

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