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First step toward complex observations by 4D-STEM with phase plate.

Mayu Togashi1, Hiroki Minoda1

  • 1Department of Applied Physics, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan.

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|April 7, 2023
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Summary
This summary is machine-generated.

This study introduces a new method for quantitative phase modulation analysis in scanning transmission electron microscope (STEM) images. The technique accurately measures phase modulation, advancing complex material structure observations.

Keywords:
Electron wavesPhase contrastPhase modulationPhase-contrast transfer functionPhase-plateScattering contrastTwo-dimensional electron detector

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Area of Science:

  • Materials Science
  • Electron Microscopy
  • Physics

Background:

  • Quantitative electron microscopy is crucial for correlating material properties with structure.
  • Accurate phase modulation measurement is challenging due to phase-contrast transfer function (PCTF) effects.

Purpose of the Study:

  • To develop a method for quantitatively deriving scattering and phase contrast components from STEM images.
  • To evaluate phase modulation using a phase plate and 2D detector.
  • To perform PCTF correction for accurate phase modulation assessment.

Main Methods:

  • Utilized a phase plate and a 2D electron detector in STEM imaging.
  • Applied a filter function to the Fourier transform of images for PCTF correction.
  • Derived scattering and phase contrast components from STEM images.

Main Results:

  • Successfully derived scattering and phase contrast components.
  • Quantitatively evaluated phase modulation, achieving agreement with thickness-estimated values within 20% error.
  • Demonstrated PCTF correction to account for spatial frequency variations.

Conclusions:

  • The developed method enables quantitative evaluation of phase modulation in STEM.
  • This represents a significant step towards quantitative complex imaging in electron microscopy.
  • Further accuracy improvements are needed, but the method is a foundational advancement.