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High Sensitivity Refractometer Based on Reflective Smf-Small Diameter No Core Fiber Structure.

Guorui Zhou1,2, Qiang Wu3, Rahul Kumar4

  • 1Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China. zhougr@caep.cn.

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Summary

A novel high-sensitivity refractive index sensor utilizes a small diameter no core fiber (SDNCF). This fiber optic sensor demonstrates significant potential for precise refractive index measurements in various applications.

Keywords:
no core fiberoptical fiber sensorrefractometersingle mode-multimode-single mode (SMS) structure

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Area of Science:

  • Optical Fiber Sensing
  • Nanotechnology
  • Photonics

Background:

  • Refractive index sensors are crucial for real-time monitoring in chemical and biological processes.
  • Existing fiber optic sensors often face limitations in sensitivity and detection range.
  • Developing cost-effective and high-performance refractive index sensors remains an active research area.

Purpose of the Study:

  • To propose and investigate a novel high-sensitivity refractive index sensor.
  • To explore the influence of structural parameters (diameter and length) of a small diameter no core fiber (SDNCF) on sensor performance.
  • To validate simulation results with experimental data for practical application.

Main Methods:

  • Fabrication of a sensor probe using a fusion-spliced single mode fiber (SMF) and SDNCF.
  • Coating the SDNCF end face with a gold thin film for light reflection.
  • Investigating the impact of SDNCF diameter and length through both optical simulations and experimental measurements.

Main Results:

  • The diameter of the SDNCF significantly influences the sensor's refractive index sensitivity.
  • The length of the SDNCF demonstrates a limited impact on the overall sensitivity.
  • Experimental results achieved a sensitivity of 327 nm/RIU for refractive indices from 1.33 to 1.38, closely matching simulated sensitivity of 349.5 nm/RIU.

Conclusions:

  • The proposed single mode-small diameter no core fiber structure offers a promising platform for high-sensitivity refractive index sensing.
  • Optimization of the SDNCF diameter is key to maximizing sensor performance.
  • The sensor exhibits excellent agreement between simulated and experimental outcomes, indicating its potential for practical applications.