Electron vortex production and control using aberration induced diffraction catastrophes

Timothy Petersen, Matthew Weyland, David Paganin, Tapio Petteri Simula, Samuel Anthony Eastwood, Michael John Morgan

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An aberration corrected electron microscope is used to create electron diffraction catastrophes,containing arrays of intensity zeros threading vortex cores. Vortices are ascribed to these arrays using catastrophe theory, scalar diffraction integrals, and experimentally retrieved phase maps. From measured wave function phases, obtained using focal-series phase retrieval, the orbital angular momentum density is mapped for highly astigmatic electron probes. We observe vortex rings and topological reconnections of nodal lines by tracking the vortex cores using the retrieved phases.
Original languageEnglish
Article number033901
Number of pages5
JournalPhysical Review Letters
Issue number3
Publication statusPublished - 2013

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