Efficient sorting of free electron orbital angular momentum

McMorran, B. J., Harvey, T. R. and Lavery, M. P.J. (2017) Efficient sorting of free electron orbital angular momentum. New Journal of Physics, 19, 023053. (doi: 10.1088/1367-2630/aa5f6f)

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We propose a method for sorting electrons by orbital angular momentum (OAM). Several methods now exist to prepare electron wavefunctions in OAM states, but no technique has been developed for efficient, parallel measurement of pure and mixed electron OAM states. The proposed technique draws inspiration from the recent demonstration of the sorting of OAM through modal transformation. We show that the same transformation can be performed on electrons with electrostatic optical elements. Specifically, we show that a charged needle and an array of electrodes perform the transformation and phase correction necessary to sort OAM states. This device may enable the analysis of the spatial mode distribution of inelastically scattered electrons.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Lavery, Professor Martin
Authors: McMorran, B. J., Harvey, T. R., and Lavery, M. P.J.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:New Journal of Physics
Publisher:IOP Publishing
ISSN (Online):1367-2630
Published Online:27 February 2017
Copyright Holders:Copyright © 2017 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
First Published:First published in New Journal of Physics 19:023053
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
712491High Dimensional Free-space Building-to-Building Link for Last-Mile CommunicationsMartin LaveryEngineering & Physical Sciences Research Council (EPSRC)EP/N032853/1ENG - ENGINEERING ELECTRONICS & NANO ENG