Journal Article

FZJ-2017-04051

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Generation of electron vortex beams using line charges via the electrostatic Aharonov-Bohm effect

Pozzi, G. (Corresponding author) ; Lu, P.-H. ; Tavabi, A. H.FZJ* ; Duchamp, M. ; Dunin-Borkowski, R.FZJ*

2017
Elsevier Science Amsterdam

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Please use a persistent id in citations: http://hdl.handle.net/2128/14669  doi:10.1016/j.ultramic.2017.06.001

Abstract: It has recently been shown that an electron vortex beam can be generated by the magnetic field surrounding the tip of a dipole-like magnet. This approach can be described using the magnetic Aharonov-Bohm effect and is associated with the fact that the end of a long magnetic rod can be treated approximately as a magnetic monopole. However, it is difficult to vary the magnetisation of the rod in such a setup and the electron beam vorticity is fixed for a given tip shape. Here, we show how a similar behaviour, which has the advantage of easy tuneability, can be achieved by making use of the electrostatic Aharonov-Bohm effect associated with an electrostatic dipole line. We highlight the analogies between the magnetic and electrostatic cases and use simulations of in-focus, Fresnel and Fraunhofer images to show that a device based on two parallel, oppositely charged lines that each have a constant charge density can be used to generate a tuneable electron vortex beam. We assess the effect of using a dipole line that has a finite length and show that if the charge densities on the two lines are different then an additional biprism-like effect is superimposed on the electron-optical phase.

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)
2. Mikrostrukturforschung (PGI-5)

Research Program(s):

1. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)

Appears in the scientific report 2017

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Database coverage:
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