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Toward single mode, atomic size electron vortex beams.

Ondrej L Krivanek1, Jan Rusz2, Juan-Carlos Idrobo3

  • 11Nion Co.,1102 8th St. Kirkland,WA 98033,USA.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
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Summary
This summary is machine-generated.

We developed a practical method to create electron vortex beams for scanning transmission electron microscopes (STEM). This technique enables atom-sized beams with high current, advancing nanoscale imaging capabilities.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Electron vortex beams offer unique properties for advanced microscopy.
  • Generating stable, single-mode electron vortex beams is crucial for high-resolution imaging.

Purpose of the Study:

  • To present a practical method for producing single-mode electron vortex beams.
  • To demonstrate the feasibility of implementing this method in scanning transmission electron microscopes (STEM).

Main Methods:

  • Utilizing a holographic "fork" aperture to generate multiple beams with varying orbital angular momenta.
  • Magnifying and then selecting a single desired beam using a narrow slit.
  • Demagnifying the selected beam to achieve atom-sized dimensions (1-2 Å).

Main Results:

  • The proposed method can be implemented by adding components to a cold-field emission STEM.
  • Existing instruments, like monochromated electron energy-loss spectroscopy-STEM, can be adapted for this technique.
  • Attainable atom-sized vortex beams are estimated to have ≥ 20 pA of current at 100-200 keV.

Conclusions:

  • This method provides a practical route to generating high-quality electron vortex beams.
  • The technique is adaptable to both new and existing STEM instruments.
  • The resulting atom-sized vortex beams are suitable for advanced nanoscale applications in STEM.