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Related Experiment Video

Updated: Jun 25, 2026

Single-Digit Nanometer Electron-Beam Lithography with an Aberration-Corrected Scanning Transmission Electron Microscope
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Brightness optimization in a 200 keV DTEM source by geometry-driven aberration suppression.

Paul Denham1, Pietro Musumeci1, Daniel J Masiel2

  • 1Department of Physics and Astronomy, University of California, Los Angeles, CA, USA.

Ultramicroscopy
|June 23, 2026
PubMed
Summary
This summary is machine-generated.

Researchers improved electron gun brightness for dynamic transmission electron microscopy (DTEM) by redesigning its geometry. This optimization significantly reduces aberrations, enabling higher peak currents for advanced microscopy applications.

Keywords:
Dynamic transmission electron microscopy (DTEM)Electron source aberrationsElectron source brightness optimizationElectrostatic lensesSpace chargeUltrafast electron microscopy (UTEM)

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Last Updated: Jun 25, 2026

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10:25

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Published on: September 14, 2018

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09:14

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Area of Science:

  • Electron Microscopy
  • Materials Science
  • Physics

Background:

  • Dynamic transmission electron microscopy (DTEM) demands high peak currents.
  • Conventional electron guns suffer brightness loss at required currents.
  • Electron gun redesign is crucial for advancing DTEM capabilities.

Purpose of the Study:

  • Improve brightness in a 200 keV electrostatic electron gun for DTEM.
  • Mitigate aberrations through optimized conductor geometry.
  • Enhance electron source performance for time-resolved microscopy.

Main Methods:

  • Reconfigured cathode-anode assembly as an accelerator and pre-lens.
  • Utilized third-order off-axis transfer maps with Green's-function evaluation.
  • Validated simulations against Superfish and GPT for accuracy.

Main Results:

  • Reduced spherical aberration coefficient from >150 mm to ~5-10 mm at 200 keV.
  • Achieved ~1 mA peak current with a ≤10 μm exit-aperture spot.
  • Demonstrated geometry optimization as a viable route to higher brightness.

Conclusions:

  • Geometry-driven redesign offers a practical path to high-brightness, low-aberration electron sources.
  • Optimized electron guns are essential for next-generation time-resolved microscopy.
  • The study provides a validated method for electron gun design and performance prediction.