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Fiber-optic waveguide coupled surface plasmon resonance sensor.

Jae Heon Ahn1, Tae Yeon Seong, Won Mok Kim

  • 1Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, South Korea.

Optics Express
|October 6, 2012
PubMed
Summary
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A new fiber-optic sensor design offers tunable wavelengths and self-referencing capabilities. This innovative approach enhances tunability and simplifies sensing without needing extra reference channels.

Area of Science:

  • Photonics and optical sensing technologies.
  • Plasmonics and metamaterials.
  • Fiber-optic sensor development.

Background:

  • Surface plasmon resonance (SPR) sensors offer high sensitivity but often lack tunability and self-referencing.
  • Existing fiber-optic sensors may require complex setups or additional reference channels for accurate measurements.

Purpose of the Study:

  • To introduce a novel fiber-optic sensor with enhanced tunability and inherent self-referencing capabilities.
  • To explore the application of waveguide-coupled SPR modes for precise wavelength control.
  • To demonstrate a self-referencing mechanism based on differential sensitivity without external references.

Main Methods:

  • Fabrication of a sensor structure featuring a dielectric waveguide sandwiched between two metal layers.

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  • Excitation of waveguide-coupled SPR modes using p- and s-polarized light.
  • Experimental validation using sucrose solutions of varying concentrations to measure sensitivity differences.

    • Main Results:

    • Achieved precise tunability of resonance wavelength across a broad spectrum (visible to infrared).
    • Demonstrated selective excitation of multiple modes for diverse applications.
    • Verified self-referencing capability through distinct sensitivity variations between plasmonic and waveguide modes.
    • Experimental results confirmed the sensor's feasibility for concentration measurements.

    Conclusions:

    • The developed waveguide-coupled SPR fiber-optic sensor provides excellent tunability and self-referencing.
    • This approach eliminates the need for a separate reference channel, simplifying sensor design and operation.
    • The sensor shows significant potential for various sensing applications requiring high precision and adaptability.