title: Novel vortex generator and mode converter for electron beams.
abstract: A mode converter for electron vortex beams is described. Numerical simulations, confirmed by experiment, show that the converter transforms a vortex beam with a topological charge m=±1 into beams closely resembling Hermite-Gaussian HG(10) and HG(01) modes. The converter can be used as a mode discriminator or filter for electron vortex beams. Combining the converter with a phase plate turns a plane wave into modes with topological charge m=±1. This combination serves as a generator of electron vortex beams of high brilliance.
authors.affiliation: Institut für Festkörperphysik, Technische Universität Wien, A-1040 Wien, Austria. schattschneider@ifp.tuwien.ac.at
authors.forename: P
authors.initials: P
authors.lastname: Schattschneider
authors.forename: M
authors.initials: M
authors.lastname: Stöger-Pollach
authors.forename: J
authors.initials: J
authors.lastname: Verbeeck