Dresden 2026 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 2: Implementations I
QI 2.5: Vortrag
Montag, 9. März 2026, 10:45–11:00, BEY/0245
shaping free electron wavepackets 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
Free-electron interactions with light and matter have long served as a cornerstone for exploring the quantum and ultrafast dynamics of material excitation. Here, we investigate how the plasmonic near-fields of gold nanorods and dimers modulate slow-electron wavepackets and result in controlled elastic and inelastic interactions beyond the nonrecoil approximation. We first show that tailoring the geometry, polarization, and near-field topology of the nanorod, together with adjusting the phase offset between sequential near-field components through phase-locked gating, enables deterministic control over momentum transfer to the electron, including both inelastic longitudinal energy exchange and transverse recoil of the electron beam. We then study electron shaping under rotating plasmonic fields generated either by two orthogonally polarized pulses with controlled phase delay or by circularly polarized light with defined handedness, which leads to angular-momentum transfer and a strong handedness-dependent electron modulation in both real- and reciprocal space. These results underscore the versatility of engineered plasmonic near-fields for shaping free-electron beams and open new opportunities 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