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TUE: Tuesday Contributed Sessions
TUE 11: Quantum Optics and Quantum Computation
TUE 11.7: Vortrag
Dienstag, 9. September 2025, 15:45–16:00, ZHG104
Shaping Slow Electron Beam with Plasmonic Near-field — •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 progress in laser-induced near-field electron-photon interactions has opened new possibilities for quantum-coherent manipulation of free-electron wavepackets. In this work, we investigate how polarization, phase control, and field symmetry control inelastic and elastic interactions between slow electrons and plasmonic near-fields near gold nanorods beyond the nonrecoil approximation. First, we explore how the direction of the linear laser pulse controls energy transfer and transverse recoil of the electron beam. Extending this approach, we employ a sequential phase-locked interaction scheme and show that the initial optical phase and the phase offset between localized dipolar zones influence both amplitude and phase modulation of the electron wavepacket. Finally, we study electron shaping under the influence of a rotating plasmonic field, considering plasmonic rotors generated by two orthogonally polarized laser pulses with a controlled phase delay and circularly polarized light with defined handedness. We demonstrate angular momentum transfer and directional dependence of the electron modulation on the handedness of the plasmonic field in both real and reciprocal space. These results highlight the versatility of tailored near-fields for shaping free-electron beams and offer new tools for ultrafast interferometry and quantum-coherent electron microscopy.
Keywords: Plasmonic rotors; Photon-induced near-field electron microscopy; Electron wavepacket shaping; Localized electromagnetic fields; Angular momentum transfer