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.
Original language | English |
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Article number | 064801 |
Number of pages | 5 |
Journal | Physical Review Letters |
Volume | 111 |
Issue number | 6 |
DOIs | |
Publication status | Published - 8 Aug 2013 |
Externally published | Yes |