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Updated: May 8, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
Exploiting lens aberrations to create electron-vortex beams
L Clark1, A Béché, G Guzzinati
1EMAT, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium. laura.clark@ua.ac.be
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 condenser plane. Experimental results are found to be in good agreement with simulations.
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