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Optical Fiber Cladding SPR Sensor Based on Core-Shift Welding Technology.

Yong Wei1,2, Jiangxi Hu3, Ping Wu4

  • 1Chongqing Municipal Key Laboratory of Intelligent Information Processing and Control of Institutions of Higher Education, Chongqing Three Gorges University, Chongqing 404100, China. weiyong@hrbeu.edu.cn.

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Summary
This summary is machine-generated.

This study introduces a novel optical fiber surface plasmon resonance (SPR) sensor fabricated using core-shift welding. The single-mode fiber cladding SPR sensor demonstrates high sensitivity, reaching 2538 nm/RIU.

Keywords:
fiber cladding SPRsurface plasmon resonance

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Area of Science:

  • Photonics
  • Nanotechnology
  • Sensing Technology

Background:

  • Traditional optical fiber surface plasmon resonance (SPR) sensors require complex cladding removal.
  • Existing methods for SPR sensor fabrication are often intricate and time-consuming.

Purpose of the Study:

  • To develop a simplified fabrication method for optical fiber SPR sensors.
  • To investigate the performance of SPR sensors based on different fiber claddings.

Main Methods:

  • Utilized core-shift welding to inject transmitted light into fiber cladding.
  • Created a Kretschmann structure by plating a 50-nm gold film onto the cladding-air interface.
  • Realized SPR sensing in single-mode fiber (SMF), graded-index multimode fiber (GIMF), and step-index multimode fiber (SIMF) claddings.

Main Results:

  • The step-index multimode fiber cladding SPR sensor exhibited the deepest resonance valley and narrowest full width at half maximum due to complete light field coupling to the cladding.
  • The single-mode fiber cladding SPR sensor achieved the highest sensitivity.
  • Optimized single-mode fiber cladding SPR sensor reached a mean sensitivity of 2538 nm/RIU.

Conclusions:

  • Core-shift welding offers a simplified approach to fabricating optical fiber SPR sensors.
  • Single-mode fiber cladding SPR sensors present superior sensitivity for refractive index sensing applications.