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Sensitivity maximized near-field scanning optical microscope with dithering sample stage.

Kyoung-Duck Park1, Seung Gol Lee, Chaejeong Heo

  • 1Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 500-712, South Korea.

The Review of Scientific Instruments
|October 2, 2012
PubMed
Summary

We improved near-field scanning optical microscope (NSOM) sensitivity by dithering the sample instead of the probe. This novel approach maintains a high Q factor, enabling precise gap control and sub-nanometer vertical resolution for imaging materials like graphene.

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Area of Science:

  • Microscopy
  • Nanotechnology
  • Materials Science

Background:

  • Conventional near-field scanning optical microscopes (NSOM) often suffer from reduced sensitivity.
  • The tip-dithering feedback mechanism in traditional NSOM decreases the Q factor due to probe attachment, impacting performance.

Purpose of the Study:

  • To develop a higher sensitivity NSOM by implementing a sample-dithering feedback mechanism.
  • To overcome the limitations of probe-dithering in maintaining high Q factors for improved gap control.

Main Methods:

  • A novel NSOM scheme utilizing a dithering sample stage for constant gap control.
  • The sample is directly loaded onto a dithering tuning fork, while the probe remains immobile.
  • Shear force detection is employed for precise gap control between the probe and sample.

Main Results:

  • The sample-dithering approach preserves a high Q factor (96% of original), unlike the drastic decrease seen in tip-dithering methods.
  • This high Q factor allows for highly sensitive shear force detection and precise gap control.
  • Enabled clear observation of graphene sheets with sub-nanometer vertical resolution.

Conclusions:

  • The proposed sample-dithering NSOM scheme significantly enhances sensitivity and vertical resolution.
  • This method overcomes the Q factor degradation issue associated with conventional tip-dithering NSOM.
  • Achieved unprecedented sub-nanometer vertical resolution for imaging graphene, surpassing conventional NSOM capabilities.