SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 83: Focus Session: Ultrafast Dynamics in Nanostructures II

O 83.5: Topical Talk

Donnerstag, 30. März 2023, 16:15–16:45, GER 38

Ultrafast coherent manipulation of free electrons via quantum interaction with shaped optical fields — •Giovanni Maria Vanacore — Department of Materials Science, University of Milano-Bicocca, Via Cozzi 55, 20126 Milano

The interaction between light and electrons can be exploited for generating radiation, or for controlling electron beams for dynamical investigation of materials, enabling new applications in quantum technologies and microscopy. In this contribution, I will describe an innovative method for coherent and versatile longitudinal/transverse manipulation of a free-electron wave function. Using appropriately shaped light fields in space and time, I will demonstrate how to modulate the energy, linear and orbital angular momenta, as well as spatial and temporal distributions of the electron wave function. The experiments have been performed in an ultrafast-TEM, where a pulsed electron beam was made to interact with shaped optical field generated via a spatial light modulator. The energy-momentum exchange resulting from such interaction was directly mapped via momentum-resolved ultrafast electron energy-loss spectroscopy. Our approach for arbitrary longitudinal/transverse electron modulation at the sub-fs timescale would pave the way to achieve unprecedented insights into non-equilibrium phenomena in advanced quantum materials, playing a decisive role in the rational design and engineering of future photonics and electronics application.

Funding source: SMART-electron project that has received funding from the EU Horizon 2020 Programme under GA No 964591.