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Reflection imaging with a helium zone plate microscope.

Ranveig Flatabø1, Sabrina D Eder1, Thomas Reisinger1

  • 1Department of Physics and Technology, University of Bergen, Bergen, Norway.

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|April 6, 2024
PubMed
Summary
This summary is machine-generated.

Neutral helium atom microscopy now offers reflection imaging using a focused helium beam. This novel technique achieves sub-micrometer spot sizes for enhanced surface-sensitive, non-destructive imaging.

Keywords:
Neutral helium microscopySHEM

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Area of Science:

  • Surface science
  • Atomic physics
  • Microscopy techniques

Background:

  • Neutral helium atom microscopy provides non-destructive, surface-sensitive imaging.
  • Previous methods used collimated beams (pinhole microscopy) or focused beams in transmission.
  • Focused helium beam reflection imaging was not previously demonstrated.

Purpose of the Study:

  • To demonstrate reflection imaging using a focused helium beam.
  • To achieve sub-micrometer focused spot sizes for high-resolution imaging.
  • To characterize scattering distributions from focused helium beam spots.

Main Methods:

  • Utilized a focused helium beam with an atom optical element (zone plate).
  • Obtained reflection images by scanning the focused beam across a surface.
  • Measured scattering distributions by varying the incident beam angle.

Main Results:

  • Achieved reflection images with focused helium beam spot sizes down to 4.7μm ± 0.5μm.
  • Demonstrated focusing capabilities down to approximately 1μm spot size.
  • Presented measurements of scattering distributions from the focused beam spot.

Conclusions:

  • Successfully implemented focused helium beam microscopy in reflection mode.
  • The technique offers high resolution for surface analysis.
  • Developed a specialized detector for enhanced helium microscopy experiments.