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Single-Digit Nanometer Electron-Beam Lithography with an Aberration-Corrected Scanning Transmission Electron Microscope
Published on: September 14, 2018
Nanoscale energy-filtered scanning confocal electron microscopy using a double-aberration-corrected transmission
Peng Wang1, Gavin Behan, Masaki Takeguchi
1Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom.
Physical Review Letters
|September 28, 2010
Summary
We developed an energy-filtered scanning confocal electron microscope using a transmission electron microscope with aberration correctors. This technique enables 3D chemical mapping with nanoscale precision, revealing height and thickness variations.
Area of Science:
- Materials Science
- Microscopy
- Spectroscopy
Background:
- Transmission electron microscopy (TEM) is crucial for nanoscale analysis.
- Spherical aberration correctors enhance TEM resolution.
- Confocal microscopy offers depth selectivity, but its electron microscopy analogue is challenging.
Purpose of the Study:
- To adapt a spherical aberration-corrected TEM into an energy-filtered scanning confocal electron microscope.
- To demonstrate 3D chemical mapping capabilities with high depth resolution.
- To investigate the role of chromatic aberration in this new microscopy mode.
Main Methods:
- Utilizing a transmission electron microscope equipped with two spherical-aberration correctors.
- Implementing a novel method to establish energy-filtered scanning confocal operation.
- Analyzing a carbon film sample to assess 3D chemical mapping performance.
Main Results:
- Successful operation of the TEM as an energy-filtered scanning confocal electron microscope.
- Achieved 3D chemical mapping with nanoscale sensitivity to height and thickness changes.
- Demonstrated that uncorrected chromatic aberration enhances, rather than limits, depth resolution.
Conclusions:
- The developed technique provides a new pathway for high-resolution 3D chemical analysis.
- The interplay between chromatic aberration and energy loss offers unique depth-profiling capabilities.
- This approach advances nanoscale chemical imaging in materials science.
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