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001     878149
005     20210130005416.0
024 7 _ |a 10.1016/j.ultramic.2019.112861
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100 1 _ |a Pozzi, Giulio
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245 _ _ |a Design of electrostatic phase elements for sorting the orbital angular momentum of electrons
260 _ _ |a Amsterdam
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520 _ _ |a 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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700 1 _ |a Grillo, Vincenzo
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700 1 _ |a Lu, Peng-Han
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700 1 _ |a Tavabi, Amir H.
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700 1 _ |a Karimi, Ebrahim
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700 1 _ |a Dunin-Borkowski, Rafal E.
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773 _ _ |a 10.1016/j.ultramic.2019.112861
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