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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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A multi-core holey fiber based plasmonic sensor with large detection range and high linearity.

Binbin Shuai1, Li Xia, Yating Zhang

  • 1Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, College of Optoelectronic Science and Engineering, No.1037 Luoyu Road, Wuhan, Hubei 430074, China

Optics Express
|March 16, 2012
PubMed
Summary

This study introduces a novel multi-core holey fiber plasmonic sensor. It achieves high sensitivity and linearity, offering the largest dynamic sensing range for holey fiber sensors to date.

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Area of Science:

  • Photonics and Sensing Technologies
  • Nanophotonics
  • Optical Fiber Sensors

Background:

  • Plasmonic sensors offer high sensitivity for detecting analytes.
  • Holey fibers provide unique light-confining properties for sensor development.
  • Mode coupling in optical fibers is crucial for sensor performance.

Purpose of the Study:

  • To numerically characterize a closed-form multi-core holey fiber plasmonic sensor.
  • To investigate the role of phase and loss matching in mode coupling.
  • To evaluate the sensor's sensitivity and dynamic sensing range.

Main Methods:

  • Finite element method (FEM) for numerical characterization.
  • Analysis of mode coupling properties between fundamental and plasmonic modes.

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  • Investigation of coupling behavior with varying analyte refractive index (RI).

    • Main Results:

    • Identified the critical role of both phase and loss matching in the coupling process.
    • Observed a transformation from incomplete to complete coupling as analyte RI increased.
    • Achieved high average sensitivities of 2929.39 nm/RIU (1.33-1.42 RI) and 9231.27 nm/RIU (1.43-1.53 RI).

    Conclusions:

    • The developed multi-core holey fiber plasmonic sensor demonstrates excellent performance.
    • The sensor exhibits high linearity and an unprecedented dynamic sensing range.
    • This sensor design represents a significant advancement in optical fiber sensing technology.