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Axicon Lens for Electrons Using a Magnetic Vortex: The Efficient Generation of a Bessel Beam

Changlin Zheng, Timothy C. Petersen, Holm Kirmse, Wolfgang Neumann, Michael J. Morgan, and Joanne Etheridge
Phys. Rev. Lett. 119, 174801 – Published 25 October 2017
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Abstract

We demonstrate experimentally an efficient electron axicon lens using a magnetic vortex. We show that naturally occurring magnetic vortices with circular magnetic moment distributions in a soft-magnetic thin film create conical phase shifts for fast electrons. Such radially symmetric linear phase ramps are equivalent to ideal light optical axicons. We apply this lens to generate efficient nondiffracting electron Bessel beams, which we observe experimentally in through-focus Lorentz images as well as in propagated off-axis electron holograms. This highlights the potential for using magnetic nanostructures as highly efficient and flexible phase plates for crafting desired electron beam shapes.

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  • Received 23 February 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.174801

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Accelerators & BeamsCondensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Changlin Zheng1, Timothy C. Petersen2, Holm Kirmse3, Wolfgang Neumann3,4, Michael J. Morgan2, and Joanne Etheridge1,5,*

  • 1Monash Centre for Electron Microscopy, Monash University, Victoria 3800, Australia
  • 2School of Physics and Astronomy, Monash University, Victoria 3800, Australia
  • 3Institute of Physics, Humboldt University of Berlin, D-12489 Berlin, Germany
  • 4Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403, USA
  • 5Department of Materials Science and Engineering, Monash University, Victoria 3800, Australia

  • *Corresponding author. joanne.etheridge@monash.edu

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Issue

Vol. 119, Iss. 17 — 27 October 2017

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