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Q: Fachverband Quantenoptik und Photonik
Q 20: Ultrashort Laser Pulses and Biophotonics
Q 20.1: Vortrag
Dienstag, 10. März 2020, 14:00–14:15, f435
Rescattering and space-charge trapping in strong-field photoemission from a macroscopically extruded nanoblade — •Timo Paschen1, Ryan Roussel2, Christian Heide1, Lennart Seiffert3, Joshua Mann2, Björn Kruse3, Philip Dienstbier1, Thomas Fennel3, James Rosenzweig2, and Peter Hommelhoff1 — 1Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen — 2UCLA Physics and Astronomy, Los Angeles, CA 90095-1547 — 3Institut für Physik, Universität Rostock, 18051 Rostock
We demonstrate strong-field-induced photoemission from a nanometer-sharp tungsten-covered silicon blade structure. The pronounced plateau and cut-off features observed in electron energy spectra confirm the presence of elastic rescattering in the enhanced near-fields at the surface of the one-dimensional nanostructure [1,2]. For highest intensities, charge densities in excess of 104 electrons per laser pulse and maximum kinetic energies of 1 keV are found. Furthermore, we find a change of photoemission regimes from a field-driven rescattering regime to space-charge limited emission. Accompanying time-dependent Schrödinger equation (TDSE) simulations, reproducing all salient features of the electron spectra, are presented. The above-mentioned observations make this new nanostructure a model system both for the investigation of rescattering on µm scales and light-matter interaction in the space-charge regime.
[1] M. Krüger et al., New J. Phys. 14, 085019 (2012).
[2] S. Thomas et al., New J. Phys. 17, 063010 (2015).