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Updated: Jun 20, 2026
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Single-Digit Nanometer Electron-Beam Lithography with an Aberration-Corrected Scanning Transmission Electron Microscope
Published on: September 14, 2018
Negative spherical aberration ultrahigh-resolution imaging in corrected transmission electron microscopy.
Knut W Urban1, Chun-Lin Jia, Lothar Houben
1Institute of Solid State Research and Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons, Research Centre Jülich, 52425 Jülich, Germany. k.urban@fz-juelich.de
Summary
Negative spherical aberration imaging (NCSI) provides genuine atomic resolution for crystalline materials. This technique enhances contrast through a combination of electron diffraction channelling and phase contrast, showcasing its advanced capabilities.
Area of Science:
- Materials Science
- Physics
- Microscopy
Background:
- Aberration-corrected transmission electron microscopy (TEM) enables atomic-resolution imaging.
- Negative spherical aberration imaging (NCSI) is a key technique for crystalline samples.
- Understanding the physical principles behind NCSI is crucial for its application.
Purpose of the Study:
- To review the physical background of negative spherical aberration imaging (NCSI).
- To explain the origin of high contrast in NCSI.
- To illustrate the applicability and state-of-the-art of NCSI through examples.
Main Methods:
- Review of the physical principles of negative spherical aberration imaging.
- Analysis of contrast mechanisms in NCSI, including electron diffraction channelling and phase contrast.
- Compilation of application examples for NCSI.
Main Results:
- NCSI achieves genuine atomic resolution for crystalline samples.
- High contrast in NCSI results from a synergistic combination of amplitude and phase contrast.
- Electron diffraction channelling significantly contributes to the observed contrast.
Conclusions:
- NCSI is a powerful technique for atomic-resolution imaging of crystalline materials.
- The technique's high contrast is well-understood and arises from combined contrast mechanisms.
- Numerous applications demonstrate the advanced state and utility of NCSI.
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