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Updated: Jun 15, 2026

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

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Microstructured optical fiber refractive index sensor.

Graham E Town1, Wu Yuan, Ravi McCosker

  • 1MQ Photonics, Department of Physics and Engineering, Macquarie University, NSW 2109, Australia. gtown@elec.mq.edu.au

Optics Letters
|March 19, 2010
PubMed
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A novel dual-core microstructured optical fiber enables sensitive and wide-range refractive index sensing for fluids. Selective filling enhances sensitivity by an order of magnitude for advanced optical sensing applications.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Chemical Sensing

Background:

  • Microstructured optical fibers (MOFs) offer unique light-matter interaction properties.
  • Refractive index sensing is crucial for various applications, including environmental monitoring and chemical analysis.
  • Existing sensors often face trade-offs between sensitivity and measurement range.

Purpose of the Study:

  • To design and demonstrate a dual-core microstructured optical fiber for fluid refractive index sensing.
  • To achieve both a large measurement range and high sensitivity in a single sensing device.
  • To investigate methods for enhancing sensor sensitivity through selective filling.

Main Methods:

  • Fabrication of a dual-core microstructured optical fiber.

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  • Utilizing the exponential dependence of intercore coupling on the analyte's refractive index.
  • Employing selective filling of the fiber's microstructure with the fluid analyte.

    • Main Results:

    • The dual-core fiber demonstrated effective refractive index sensing of fluids.
    • The device achieved both a large sensing range and high sensitivity.
    • Selective filling of the microstructure increased the sensor's sensitivity by approximately one order of magnitude.

    Conclusions:

    • Dual-core MOFs provide a versatile platform for high-performance refractive index sensing.
    • The proposed sensing mechanism allows for simultaneous optimization of range and sensitivity.
    • Selective filling is a viable strategy to boost sensor sensitivity for demanding applications.