Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 52: Ultrashort Laser Pulses II
Q 52.8: Vortrag
Donnerstag, 3. März 2016, 16:15–16:30, a310
Two-color multi-photon photoemission from a tungsten nano-tip: Time-resolved dynamics — •Timo Paschen1, Michael Förster1,2, Michael Krüger1,2, Florian Libisch3, Christoph Lemell3, Georg Wachter3, Thomas Madlener3, Joachim Burgdörfer3, and Peter Hommelhoff1,2,4 — 1Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstrasse 1, 91058 Erlangen — 2Max-Planck Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching — 3Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10/E136, 1040 Wien — 4Max-Planck Institut für die Physik des Lichts, Günther-Scharowsky-Str. 1/Geb. 24, 91058 Erlangen
By superimposing a fundamental laser pulse and a perturbative second harmonic admixture on a nanometric metal tip we coherently control multi-photon photoemission. We show that the photo-induced electron emission is dependent on the phase of the two light fields. By using a single solid state nanoemitter, contrast values of the phase-dependent electron signal of more than 90 per cent are reached, which is among the highest reported values for two-color coherent control measurements [1]. The experimentally observed phase-dependent electron emission is explained via quantum pathway interference and is compared to time-dependent density functional theory (TDDFT) and DFT simulations [2].
[1] P. Ackermann et al., Phys. Rev. A, 89, 063804 (2014).
[2] M. Förster et al., manuscript in preparation.