Extreme-Ultraviolet Vortices from a Free-Electron Laser

Optical vortices are helically phased light beams with a field dependence of ( ), where is the topological charge and the azimuthal coordinate in the plane perpendicular to the beam propagation. Such beams carry an orbital angular momentum (OAM) of ħ per photon. The interaction between matter and extreme-ultraviolet (EUV) optical vortices is predicted to trigger new phenomena. Among these are violation of dipolar selection rules during photoionization [1], generation of charge current loops in fullerenes with an associated orbital magnetic moment [2], and the production of skyrmionic defects [3], promising for applications magnetic memory devices on the nanoscale.

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