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.
- Received 24 May 2013
DOI:https://doi.org/10.1103/PhysRevLett.111.064801
© 2013 American Physical Society
Synopsis
Into the Vortex
Published 8 August 2013
With a few simple adjustments, an electron beam can be turned into a spiraling vortex beam.
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