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Q: Fachverband Quantenoptik und Photonik

Q 59: Poster IV

Q 59.68: Poster

Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof

Quantum coherent interactions between electron vortices and chiral optical near-fields — •Neli Streshkova and Martin Kozák — Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, CZ-121 16 Prague, Czech Republic

In the recent years new possibilities of shaping free electron beams into the so-called vortex beams have emerged. They hold the promise for many applications in electron microscopy. Specifically, electron vortex beams could be used as a sensitive probe for monitoring the optical near-fields, which emerge around chiral nanostructures under laser light illumination, with near nanometer precision.

Here we present numerical simulations of the inelastic interaction between electron vortex beams and chiral optical near-fields. Initially, the electron wavefunction is modulated via inelastic ponderomotive scattering induced by the interference of two optical waves, one of which is an optical vortex wave carrying orbital angular momentum (OAM). The OAM is transferred to the electron beam, which then interacts with a chiral optical near-field of a golden nanosphere excited by circularly polarized optical field. This interaction leads to changes in the electron spectrum in dependence on the amplitude of the near-field, phase relation between the near-field and the modulating fields and the interplay between the helicity of the beam and the near-field itself. Such interaction scheme will in future allow full reconstruction of the optical and plasmonic near-field distribution of various nanostructures including both the amplitude and the phase.