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Surface-Enhanced Absorption Spectroscopy for Optical Fiber Sensing.

Silje S Fuglerud1,2, Karolina Milenko1, Astrid Aksnes1

  • 1Department of Electronic Systems, Norwegian University of Science and Technology, O.S. Bragstads plass 2b, 7034 Trondheim, Norway.

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Summary
This summary is machine-generated.

Surface-enhanced infrared absorption spectroscopy (SEIRAS) was adapted for fiber-optic probes. This technique enhances signal detection for remote sensing applications, improving sensitivity for low-concentration compounds.

Keywords:
SEIRASVis/NIR spectroscopygoldoptical fibersensingsurface enhancement

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Area of Science:

  • Spectroscopy
  • Plasmonics
  • Optical sensing

Background:

  • Visible and near-infrared spectroscopy are crucial for sensing but struggle with low-concentration analytes.
  • Surface plasmon resonance (SPR) enhances absorption spectroscopy signals via near-field effects.
  • Surface-enhanced infrared absorption spectroscopy (SEIRAS) is typically confined to laboratory settings.

Purpose of the Study:

  • To integrate SEIRAS with fiber-optic probes for enhanced remote sensing.
  • To demonstrate plasmon-enhanced absorption on a fiber-optic platform.

Main Methods:

  • A coreless optical fiber was tapered and coated with a 100 nm gold (Au) film.
  • The Au-coated fiber probe was used to measure absorption of Rhodamine 6G and Crystal Violet dyes.
  • Absorbance signals were compared between coated and uncoated fibers across a range of concentrations (5 × 10-8 to 8 × 10-4 mol/L).

Main Results:

  • The gold-coated fiber exhibited enhanced absorption signals at visible wavelengths.
  • Absorbance signals for Rhodamine 6G and Crystal Violet were 2-3 times higher with the Au film compared to the uncoated fiber.
  • Signal enhancement was observed across a wide concentration range, indicating robust performance.

Conclusions:

  • SEIRAS can be successfully implemented on an optical fiber probe.
  • This fiber-optic SEIRAS approach enables enhanced signal detection for remote sensing.
  • The study paves the way for practical SEIRAS applications in real-world sensing scenarios.