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Exploiting lens aberrations to create electron-vortex beams
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| Abstract |
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| 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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English
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| Source (journal) |
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Physical review letters. - New York, N.Y. | |
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New York, N.Y. : 2013
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| ISSN |
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0031-9007
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111:6(2013), p. 1-5
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| Article Reference |
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064801
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| ISI |
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000322921200009
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E-only publicatie
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