Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Photonics and Nanooptics II: Nonlinear Response
O 52.4: Vortrag
Mittwoch, 9. März 2016, 11:15–11:30, S051
Coherent control of photoemission from a single nanotip in a two-color scheme — •Michael Förster1,2, Timo Paschen1, 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
We discuss coherent control of photoemission from a tungsten tip in a Brumer-Shapiro scheme. We observe that photoemission from the nanotip induced by a femtosecond laser displaying many multiphoton orders can be strongly enhanced or reduced by the presence of a weak second harmonic, depending on the phase between the laser pulses. With optimized parameters the phase-dependent contrast in the total emitted current can exceed 90%. Time-resolved data shows that emission takes place on femtosecond time scales. With the help of spectrally-resolved measurements and density functional theory calculations we interpret our observations in terms of interfering emission pathways.