SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 83: Focus Session: Ultrafast Dynamics in Nanostructures II
O 83.7: Vortrag
Donnerstag, 30. März 2023, 17:00–17:15, GER 38
Controlling and shaping the electron recoil and energy transfer via nearfield geometry — •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
Inelastic interaction of free-electrons with optical near fields has recently attracted attention for manipulating and shaping free-electron wave packets. Understanding the nature and the dependence of the inelastic cross section on the polarization of the optical near-field modes of the nanostructures is important for both fundamental studies and the development of new applications in this field. Here, we investigate the effect of the laser-field polarization and nanostructures asymmetric geometry on shaping free-electrons and controlling the energy transfer mechanisms, but also tailoring the electron recoil. We show that, an oblique incident electric field improves the coupling efficiency for coherent control of the longitudinal and transversal phase modulation of an electron wave packet. We also demonstrate the possibility of tailoring the shape of the localized plasmons by incorporating specific arrangements of nanorods to enhance or hamper the transversal and longitudinal recoils of free-electrons. Our findings open up a route towards the spatial characterization of plasmonic near-fields for the coherent manipulation and control of slow electron beams for creating desired shapes of electron wave packets.