Exploiting lens aberrations to create electron vortex beams
Optics
2014-02-10 v2 Quantum Physics
Abstract
A model for a new electron vortex beam production method is proposed and experimentally demonstrated. The technique calls on the controlled manipulation of the degrees of freedom of the lens aberrations to achieve a helical phase front. These degrees of freedom are accessible by using the corrector lenses of a transmission electron microscope. The vortex beam is produced through a particular alignment of these lenses into a specifically designed astigmatic state and applying an annular aperture in the condensor plane. Experimental results are found to be in good agreement with simulations.
Cite
@article{arxiv.1305.5463,
title = {Exploiting lens aberrations to create electron vortex beams},
author = {L. Clark and A. Béché and G. Guzzinati and A. Lubk and M. Mazilu and R. Van Boxem and J. Verbeeck},
journal= {arXiv preprint arXiv:1305.5463},
year = {2014}
}
Comments
5 pages, 4 figures