Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 70: Nanophotonics I
Q 70.2: Talk
Friday, March 14, 2025, 11:15–11:30, HS I PI
Electron Beam Shaping with Ultrafast Plasmonic Rotors — •Fatemeh Chahshouri1 and Nahid Talebi1,2 — 1Institute of Experimental and Applied Physics, Kiel University, 24098 Kiel, Germany — 2Kiel, Nano, Surface, and Interface Science KiNSIS, Kiel University, 24098 Kiel, Germany
Recent advances in coherent quantum interactions between free-electron pulses and ultrafast laser-induced near-field oscillations have unlocked exciting possibilities for manipulating the electron wavepackets. In this study, we investigate the interaction between a slow electron beam and the rotating dipolar plasmon fields of a gold nanorod. By precisely controlling the phase offset between two orthogonal laser pulses with perpendicular polarizations, we generate plasmonic fields in the nanorod circulating in clockwise or counterclockwise directions. Our findings demonstrate that the rotational direction of these plasmons plays a critical role in modulating electron dynamics in both real and reciprocal space, significantly influencing its longitudinal and transverse recoil. Additionally, by synchronizing the interaction time of the electron wavepacket with these directional plasmonic oscillations, we observe alterations in the probability amplitude of the electron angular momentum. This strong directional dependence highlights the potential of rotating plasmons as a powerful tool for shaping electron wavepackets. These findings pave the way for advancements in ultrafast electron microscopy and spectroscopy, enabling coherent control of slow electron beams and contributing to the development of quantum information processing technologies.
Keywords: Plasmonic rotors; Electron wavepacket shaping; Localized electromagnetic fields; Angular momentum transfer