Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 83: Poster Focus Session: Structural Dynamics in Nanoscale Materials, Probed by Ultrafast Electron Pulses

O 83.6: Poster

Mittwoch, 14. März 2018, 18:15–20:30, Poster A

Ultrafast electron dynamics in free space controlled by femtosecond laser pulses — •Norbert Schönenberger, Martin Kozák, Joshua McNeur, Peyman Yousefi, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen

Pulsed electron beams are a unique probe for ultrafast studies of condensed matter systems, since they allow for both high spatial and temporal resolution. Light in the visible or near-infrared is an ideal candidate for controlling these electrons on single-femtosecond or even attosecond timescales. This can be achieved using electromagnetic near-fields created at dielectric structures, so called dielectric laser accelerators (DLAs) [1]. In recent years, these devices have gained attention with the goal to build fully photonic particle accelerators. We report on new structures allowing better transverse control of the electron beam, leading to a more homogeneous interaction and providing a higher acceleration gradient. Furthermore, we present a technique for inelastic scattering of electron at a light wave in free space [2]. Two laser pulses are used to form an optical travelling wave that interacts with the electrons via ponderomotive scattering, provided that the parameters are chosen for the proper phase-matching. Both methods show promise for creating high-energy attosecond probes for the future ultrafast diffraction and microscopy research.

[1] Kozak M., McNeur J., et.al: Nat. Comms 8 (2017), DOI: 10.1038/ncomms14342 [2] Kozák, M., Eckstein, T., Schönenberger, N. & Hommelhoff, P., Nat. Phys. (2017), DOI: 10.1038/NPHYS4282.