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Spectroscopy with scanning near-field optical microscopy using photon tunnelling mode.

S Takahashi1, M Futamata, I Kojima

  • 1Joint Research Center for Atom Technology-Angstrom Technology Partnership, National Institute for Advanced Interdisciplinary Research, Tsukuba, Ibaraki, Japan. takasa@jrcat.or.jp

Journal of Microscopy
|June 5, 2001
PubMed
Summary

This study demonstrates Raman spectroscopy with scanning near-field optical microscopy (SNOM) using photon tunneling. This technique enhances signal detection for materials like copper phthalocyanine without surface enhancement.

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Area of Science:

  • Spectroscopy
  • Nanotechnology
  • Materials Science

Background:

  • Raman spectroscopy provides valuable chemical information.
  • Scanning near-field optical microscopy (SNOM) offers high spatial resolution.
  • Integrating Raman spectroscopy with SNOM presents challenges in signal detection and probe interference.

Purpose of the Study:

  • To demonstrate a novel method for performing Raman spectroscopy using scanning near-field optical microscopy (SNOM).
  • To overcome limitations of existing SNOM Raman techniques, particularly probe-induced scattering.
  • To obtain high-quality Raman spectra of materials under specific conditions.

Main Methods:

  • Utilized photon tunneling mode in SNOM.
  • Employed an attenuated total reflection (ATR) configuration for sample illumination.

Related Experiment Videos

  • Employed a sharpened optical fiber probe to collect the evanescent wave perturbed by the sample.
  • Minimized Raman scattering originating from the optical fiber probe.

    • Main Results:

    • Successfully demonstrated Raman spectroscopy coupled with SNOM.
    • Achieved significant reduction in Raman scattering from the optical fiber probe.
    • Enabled excitation of the sample with higher intensity laser light compared to illumination mode SNOM.
    • Obtained off-resonance Raman spectra of copper phthalocyanine (CuPc) without surface-enhanced Raman scattering (SERS).

    Conclusions:

    • The demonstrated photon tunneling SNOM technique is effective for acquiring Raman spectra.
    • This method allows for enhanced excitation intensity and reduced probe interference.
    • It provides a viable approach for analyzing materials like CuPc without relying on SERS.