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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Optical fiber sensor based on oblique angle deposition.

Sasani Jayawardhana1, Gorgi Kostovski, Alex P Mazzolini

  • 1Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Mail H38, P.O. Box 218, Hawthorn, Victoria 3122, Australia. sjayawardhana@swin.edu.au

Applied Optics
|January 12, 2011
PubMed
Summary

Nanostructured metal coatings on optical fiber tips show excellent surface-enhanced Raman scattering (SERS) performance for direct measurements. Remote sensing applications are limited by reduced transmission and coupling efficiency with longer nanorods.

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Area of Science:

  • Materials Science and Engineering
  • Nanotechnology
  • Spectroscopy

Background:

  • Oblique angle deposition (OAD) is a versatile technique for creating nanostructured thin films.
  • Optical fiber-based sensors offer advantages for remote and in-situ measurements.
  • Surface-enhanced Raman scattering (SERS) is a highly sensitive technique for molecular detection.

Purpose of the Study:

  • To fabricate nanostructured metal coatings on optical fiber tips using OAD.
  • To evaluate the SERS performance of these nanocoatings for direct and remote sensing.
  • To investigate the influence of nanostructure morphology on SERS efficiency and measurement variability.

Main Methods:

  • Fabrication of nanostructured metal coatings on silica optical fiber tips via thermal evaporation with oblique angle deposition.

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  • Characterization of nanorod coating morphology and dimensions.
  • SERS measurements using thiophenol as a test analyte, comparing direct and remote sensing configurations.
  • Analysis of measurement variability and transmission efficiency as a function of nanorod length.

    • Main Results:

    • Successfully fabricated nanostructured metal coatings with extended rodlike structures on fiber tips.
    • Achieved excellent SERS performance with low variability (<10%) for direct measurements.
    • Observed no performance improvement in remote sensing compared to thin metal island films.
    • Identified reduced transmission and coupling efficiency variations as limiting factors for remote sensing with nanorod lengths exceeding ~100 nm, increasing variability to 18%.

    Conclusions:

    • Nanostructured metal coatings on optical fiber tips show promise for direct SERS measurements.
    • The performance of these nanorod coatings in remote sensing configurations is hindered by optical transmission losses and coupling efficiency variations.
    • Further optimization is needed to improve the remote sensing capabilities of fiber-tip nanostructured SERS sensors.