A novel vortex generator and mode converter for electrons
Peter Schattschneider, Michael Stoeger-Pollach, Johan Verbeeck

TL;DR
This paper introduces a new vortex generator and mode converter for electron beams, enabling transformation, discrimination, and high-brilliance generation of vortex modes with potential applications in electron microscopy.
Contribution
It presents a novel mode converter for electron vortex beams, validated by simulations and experiments, that can transform, discriminate, and generate high-brilliance vortex modes.
Findings
Converter transforms $m=\pm 1$ beams into Hermite-Gaussian modes
Experimental confirmation of simulation results
Enables high-brilliance electron vortex beam generation
Abstract
A mode converter for electron vortex beams is described. Numerical simulations, confirmed by experiment, show that the converter transforms a vortex beam with topological charge into beams closely resembling Hermite-Gaussian HG and HG 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 . This combination serves as a generator of electron vortex beams of high brilliance.
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