Journal Article

FZJ-2020-02662

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Design of electrostatic phase elements for sorting the orbital angular momentum of electrons

Pozzi, G. ; Grillo, V. (Corresponding author) ; Lu, P.-H.FZJ* ; Tavabi, A. H.FZJ* ; Karimi, E. ; Dunin-Borkowski, R. E.FZJ*

2020
Elsevier Science Amsterdam

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Please use a persistent id in citations: http://hdl.handle.net/2128/25745  doi:10.1016/j.ultramic.2019.112861

Abstract: The orbital angular momentum (OAM) sorter is a new electron optical device for measuring an electron’s OAM. It is based on two phase elements, which are referred to as the “unwrapper” and “corrector” and are placed in Fourier-conjugate planes in an electron microscope. The most convenient implementation of this concept is based on the use of electrostatic phase elements, such as a charged needle as the unwrapper and a set of electrodes with alternating charges as the corrector. Here, we use simulations to assess the role of imperfections in such a device, in comparison to an ideal sorter. We show that the finite length of the needle and the boundary conditions introduce astigmatism, which leads to detrimental cross-talk in the OAM spectrum. We demonstrate that an improved setup comprising three charged needles can be used to compensate for this aberration, allowing measurements with a level of cross-talk in the OAM spectrum that is comparable to the ideal case.

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)

Research Program(s):

1. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)
2. Q-SORT - QUANTUM SORTER (766970) (766970)
3. ESTEEM3 - Enabling Science and Technology through European Electron Microscopy (823717) (823717)

Appears in the scientific report 2020

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