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Related Experiment Videos

Optical near-field harmonic demodulation in apertureless microscopy.

N Maghelli1, M Labardi, S Patanè

  • 1INFM-Unità di Pisa Università, Via F. Buonarroti 2, I-57127 Pisa, Italy.

Journal of Microscopy
|April 12, 2001
PubMed
Summary

This study demonstrates apertureless near-field optical microscopy for analyzing surface optical fields. The technique achieves artifact-free imaging and detailed near-field structure analysis using harmonic detection.

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Area of Science:

  • Optics and Photonics
  • Surface Science
  • Nanotechnology

Background:

  • Near-field optical microscopy (SNOM) is crucial for nanoscale optical analysis.
  • Investigating spatial derivatives of optical fields requires advanced microscopy techniques.
  • Apertureless SNOM offers high-resolution surface imaging capabilities.

Purpose of the Study:

  • To investigate spatial derivatives of optical fields scattered by surfaces.
  • To demonstrate the capability of harmonic detection in apertureless SNOM.
  • To achieve artifact-free near-field optical imaging and detailed near-field structure analysis.

Main Methods:

  • Apertureless near-field optical microscopy with sinusoidal probe-to-sample distance modulation.
  • Detection of optical signals at the first and higher harmonics (up to fifth order).

Related Experiment Videos

  • Utilizing a scanning interference apertureless microscope with a silicon tip and a tuning-fork-based atomic force microscope for distance stabilization.
  • Employing a double-modulation technique for separating topography tracking from optical detection.

    • Main Results:

    • Successful demodulation up to the fifth harmonic order on a sample of close-packed latex spheres.
    • Demonstration of artifact-free near-field optical imaging.
    • Acquisition of detailed information on the structure of near fields scattered by the surface.

    Conclusions:

    • The described apertureless near-field optical microscopy technique enables precise analysis of surface optical fields.
    • Harmonic detection up to the fifth order provides enhanced sensitivity and specificity.
    • This method offers a powerful tool for both high-fidelity imaging and in-depth optical field structure investigation.