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arXiv · 1305.5463

Exploiting lens aberrations to create electron vortex beams

L. Clark·A. Béché·G. Guzzinati·A. Lubk·M. Mazilu·R. Van Boxem·J. Verbeeck
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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.

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L. Clark, A. Béché, G. Guzzinati, A. Lubk, M. Mazilu, R. Van Boxem, J. Verbeeck. 2013-05-23. Exploiting lens aberrations to create electron vortex beams. https://doi.org/10.1103/physrevlett.111.064801

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