$\pi$/2 Mode Converters and Vortex Generators for Electrons
Applied Physics
2019-02-15 v1 Optics
Abstract
In optics, mode conversion is an elegant way to switch between Hermite Gaussian and Laguerre Gaussian beam profiles and thereby impart orbital angular momentum onto the beam and to create vortices. In optics such vortex beams can be produced in a setup consisting of two identical cylinder lenses. In electron optics, quadrupole lenses can be used for the same purpose. Here we investigate generalized asymmetric designs of a quadrupole mode converter that may be realized within the constraints of existing electron microscopes and can steer the development of dedicated vortex generators for high brilliance electron vortex probes of atomic scale.
Cite
@article{arxiv.1902.05368,
title = {$\pi$/2 Mode Converters and Vortex Generators for Electrons},
author = {Christian Kramberger and Stefan Löffler and Thomas Schachinger and Peter Hartel and Joachim Zach and Peter Schattschneider},
journal= {arXiv preprint arXiv:1902.05368},
year = {2019}
}
Comments
9 pages 10 Figures