Optics and Precision Engineering, Volume. 27, Issue 12, 2525(2019)

Step-index multimode fiber cladding surface plasma resonance sensor

SU Yu-dong1,*... WEI Yong1, WU Ping2, HU Jiang-xi2 and LIU Chun-lan2 |Show fewer author(s)
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
  • show less

    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.

    Tools

    Get Citation

    Copy Citation Text

    SU Yu-dong, WEI Yong, WU Ping, HU Jiang-xi, LIU Chun-lan. Step-index multimode fiber cladding surface plasma resonance sensor[J]. Optics and Precision Engineering, 2019, 27(12): 2525

    Download Citation

    EndNote(RIS)BibTexPlain Text
    Save article for my favorites
    Paper Information

    Category:

    Received: Sep. 29, 2019

    Accepted: --

    Published Online: May. 12, 2020

    The Author Email: Yu-dong SU (suyudong9320@163.com)

    DOI:10.3788/ope.20192712.2525

    Topics