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Toward Single Mode, Atomic Size Electron Vortex Beams
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0002-0074-1349
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2014 (English)In: Microscopy and Microanalysis, ISSN 1431-9276, E-ISSN 1435-8115, Vol. 20, no 3, 832-836 p.Article in journal (Refereed) Published
Abstract [en]

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 mu m, selecting the desired beam with a narrow slit, and demagnifying the selected beam down to 1-2 angstrom 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.

Place, publisher, year, edition, pages
2014. Vol. 20, no 3, 832-836 p.
Keyword [en]
vortex beam, STEM, fork aperture, monochromator
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-230527DOI: 10.1017/S143192761400083XISI: 000339158700024OAI: oai:DiVA.org:uu-230527DiVA: diva2:741652
Available from: 2014-08-28 Created: 2014-08-26 Last updated: 2014-08-28Bibliographically approved

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Rusz, Jan
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