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000878149 1001_ $$0P:(DE-HGF)0$$aPozzi, Giulio$$b0
000878149 245__ $$aDesign of electrostatic phase elements for sorting the orbital angular momentum of electrons
000878149 260__ $$aAmsterdam$$bElsevier Science$$c2020
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000878149 520__ $$aThe 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.
000878149 536__ $$0G:(DE-HGF)POF3-143$$a143 - Controlling Configuration-Based Phenomena (POF3-143)$$cPOF3-143$$fPOF III$$x0
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000878149 7001_ $$0P:(DE-HGF)0$$aGrillo, Vincenzo$$b1$$eCorresponding author
000878149 7001_ $$0P:(DE-Juel1)167381$$aLu, Peng-Han$$b2
000878149 7001_ $$0P:(DE-Juel1)157886$$aTavabi, Amir H.$$b3
000878149 7001_ $$0P:(DE-HGF)0$$aKarimi, Ebrahim$$b4
000878149 7001_ $$0P:(DE-Juel1)144121$$aDunin-Borkowski, Rafal E.$$b5
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000878149 8564_ $$uhttps://juser.fz-juelich.de/record/878149/files/1906.02344.pdf$$yPublished on 2019-10-16. Available in OpenAccess from 2021-10-16.
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