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Experimental demonstration of an electrostatic orbital angular momentum sorter for electrons

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arxiv 1910.03706 v1 pith:CZ5KTUKX submitted 2019-10-08 physics.ins-det

Amir H. Tavabi , Paolo Rosi , Giulio Pozzi , Alberto Roncaglia , Stefano Frabboni , Enzo Rotunno , Peng-Han Lu , Robert Nijland
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Peter Tiemeijer Ebrahim Karimi Rafal E. Dunin-Borkowski Vincenzo Grillo
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classification physics.ins-det
keywords sorterelectronelectrostaticresolutionangularbeamsdemonstrationelectrons
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We report the first experimental demonstration of an electrostatic electron orbital angular momentum (OAM) sorter, which can be used to analyze the OAM states of electrons in a transmission electron microscope. We verify the sorter functionality for several electron beams possessing different superpositions of OAM states, and use it to record the electron beams OAM spectra. Our current electrostatic OAM sorter has an OAM resolution of 2 in the units of h/bar - the reduced Planck constant. It is expected to increase the OAM resolution of the sorter to the optimal resolution of 1 in the future via fine control of the sorting phase elements.

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