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Related Experiment Videos

Cross-point analysis for a multimode fiber sensor based on surface plasmon resonance.

Woo-Hu Tsai1, Yu-Chia Tsao, Hong-Yu Lin

  • 1Graduate Program in Electro-Optical Engineering, Tatung University, 40 Chongshan North Road, 3rd Section, Taipei 104, Taiwan.

Optics Letters
|September 30, 2005
PubMed
Summary

This study introduces a novel surface plasmon resonance (SPR) fiber sensor using a side-polished multimode fiber. The sensor demonstrates high sensitivity for refractive index changes, crucial for advanced optical sensing applications.

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Area of Science:

  • Photonics and Optical Sensing
  • Materials Science
  • Nanotechnology

Background:

  • Surface Plasmon Resonance (SPR) is a label-free optical sensing technique.
  • Optical fiber sensors offer advantages in remote and miniaturized sensing.
  • Developing high-sensitivity refractive index sensors is critical for various applications.

Purpose of the Study:

  • To present a novel SPR fiber sensor based on a side-polished multimode fiber.
  • To investigate the sensor's performance in detecting changes in refractive index.
  • To demonstrate the sensor's high sensitivity and wavelength shift characteristics.

Main Methods:

  • Fabrication of a side-polished multimode optical fiber with a 40 nm gold layer.
  • Utilizing a white-light source and an optical spectrum analyzer (OSA).

Related Experiment Videos

  • Measuring the shift in the SPR spectral dip with varying liquid refractive indices.

    • Main Results:

    • The SPR cross-point (CP) wavelength shifted from 630 to 1300 nm for refractive index changes from 1.34 to 1.46.
    • Achieved high sensitivities of 1.9 x 10^-6 RIU in a specific range.
    • Demonstrated even higher sensitivity of 5.7 x 10^-7 RIU above a refractive index of 1.44.

    Conclusions:

    • The novel SPR fiber sensor exhibits excellent sensitivity to refractive index variations.
    • The demonstrated wavelength shift of the CP is a reliable indicator of refractive index changes.
    • This technology holds promise for advanced optical sensing and analytical applications.