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Updated: Feb 4, 2026
06:49
Phase Contrast and Differential Interference Contrast DIC Microscopy
Published on: August 6, 2008
54.1K
Prospects of annular differential phase contrast applied for optical sectioning in STEM
Ultramicroscopy
|October 4, 2018
Summary
Annular differential phase contrast (ADPC) mode in scanning transmission electron microscopy (STEM) achieves atomic resolution imaging. This advanced ADPC method offers superior contrast for investigating thick samples without slicing.
Area of Science:
- Materials Science
- Physics
- Electron Microscopy
Background:
- Annular differential phase contrast (ADPC) mode in scanning transmission electron microscopy (STEM) has been realized.
- Previous implementations required specific hardware like Fresnel phase plates and detector geometries.
Purpose of the Study:
- To explore the feasibility of ADPC mode for lower voltages (20-80kV).
- To investigate material-free ADPC implementation using aberration correction.
- To enhance resolution and contrast for advanced imaging.
Main Methods:
- Image calculations to assess ADPC feasibility at lower voltages.
- Mimicking Fresnel phase plates using adjustable aberrations in a corrected STEM.
- Advanced aberration correction including chromatic and fifth-order spherical aberrations.
Main Results:
- Achieved atomic resolution and optical sectioning with a depth of field <3 Å at 30kV.
- Demonstrated significantly superior contrast compared to incoherent bright-field (IBF) and high-angle annular dark-field (HAADF) modes.
- Explored material-free ADPC implementation via aberration correction.
Conclusions:
- Advanced ADPC in STEM enables high-resolution imaging of thick samples without slicing.
- The developed method offers superior contrast for detailed structural analysis.
- This technique broadens the applicability of STEM for materials investigation.
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