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1 results

  • Toward Single Mode, Atomic Size Electron Vortex Beams

  • Ondrej L. Krivanek, Jan Rusz, Juan-Carlos Idrobo, Tracy J. Lovejoy, Niklas Dellby
  • Journal:
    Microscopy and Microanalysis / Volume 20 / Issue 3 / June 2014
    Published online by Cambridge University Press:
    07 May 2014, pp. 832-836
    Print publication:
    June 2014

  • We propose a practical method of producing a single mode electron vortex beam suitable for use in a scanning transmission electron microscope (STEM). The method involves using a holographic “fork” aperture to produce a row of beams of different orbital angular momenta, as is now well established, magnifying the row so that neighboring beams are separated by about 1 µm, selecting the desired beam with a narrow slit, and demagnifying the selected beam down to 1–2 Å in size. We show that the method can be implemented by adding two condenser lenses plus a selection slit to a straight-column cold-field emission STEM. It can also be carried out in an existing instrument, the monochromated Nion high-energy-resolution monochromated electron energy-loss spectroscopy-STEM, by using its monochromator in a novel way. We estimate that atom-sized vortex beams with ≥20 pA of current should be attainable at 100–200 keV in either instrument.