Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 42: Laser and Laser Applications
Q 42.11: Poster
Mittwoch, 16. März 2022, 16:30–18:30, P
Tracing sub-cycle electron dynamics in two-colour nearfields of nanometric metal tips — •Philip Dienstbier1, Lennart Seiffert2, Timo Paschen3, Thomas Fennel2, and Peter Hommelhoff1 — 1Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen — 2Institut für Physik, Universität Rostock, Rostock — 3Fraunhofer-Institut für Keramische Technologien und Systeme IKTS, Forchheim
Metal nanostructures exposed to intense laser fields enable the realization of strongly localized and well-controlled sub-cycle electron dynamics. These targets are readily used as high-brightness electron sources and initial building blocks for petahertz electronics. Despite broad initial success in these applications, the mapping of electron emission and propagation with attosecond precision has so far been restricted to gas phase atomic and molecular systems. Here, we show that phase-resolved photoemission in two color-laser fields can disentangle the propagation from ionization dynamics at the surface of nanometer sharp tungsten needle tips. In the experiment, the relative phase dependent plateau and cut off features in the electron spectra yields a characteristic energy dependent modulation depth and optimal phase. Matching the results with the solution of the time-dependent Schrödinger equation and with results from the simple-man’s model allow us to identify the electron wavepacket dynamics, determine precise values for the optical nearfield strengths, and enable us to infer a duration of 710±30 attoseconds for the electron emission from a solid.