2013/05/31 by L. Clark, A. Béché, G. Guzzinati +4
Physics and Astronomy · #physics.optics #quant-ph
paper · pdf · doi:10.1103/physrevlett.111.064801
published as Phys. Rev. Lett. 111, 064801 (2013) · 5 pages, 4 figures
arxiv created 2013/07/18 · arxiv updated 2014/02/10
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.