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Vortex-carrying matter waves, such as chiral electron beams, are ofsignificant interest in both applied and fundamental science. Continuous waveelectron vortex beams are commonly prepared via passive phase masks imprintinga transverse phase modulation on the electron's wave function. Here, we showthat femtosecond chiral plasmonic near fields enable the generation and dynamiccontrol on the ultrafast timescale of an electron vortex beam. The vortexstructure of the resulting electron wavepacket is probed in both real andreciprocal space using ultrafast transmission electron microscopy. This methodoffers a high degree of scalability to small length scales and a highlyefficient manipulation of the electron vorticity with attosecond precision.Besides the direct implications in the investigation of nanoscale ultrafastprocesses in which chirality plays a major role, we further discuss theperspectives of using this technique to shape the wave function of chargedcomposite particles, such as protons, and how it can be used to probe theirinternal structure.

Ultrafast Generation and Control of an Electron Vortex Beam via Chiral Plasmonic Near Fields