Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Focussed session: Coherence and coherent control in nanophotonics and plasmonics II
O 52.2: Topical Talk
Mittwoch, 28. März 2012, 17:15–17:45, MA 005
Attosecond control of electrons laser-emitted from a nanoscale metal tip — •Peter Hommelhoff1, Michael Krüger1, Markus Schenk1, Michael Förster1, Georg Wachter2, Christoph Lemell2, and Joachim Burgdörfer2 — 1MPI of Quantum Optics, Garching, Germany — 2Technical University of Vienna, Vienna, Austria
With carrier-envelope phase stable few-cycle laser pulses we demonstrate steering of electrons photo-emitted from a nanoscale metal tip with the optical electric field of the laser pulses. In spectrally resolved measurements we have observed strong-field effects such as peak shifting and peak suppression already at moderate laser intensities of less than 1012 W/cm2, owing to field enhancement [1]. The formation of interference fringes in the photoelectron energy spectrum as function of the carrier-envelope phase points at electronic matter wave interference in the time-domain. We explain our results with the classical three-step model, including rescattering [2]. A detailed simulation based on time-dependent density functional theory corroborates our findings and can be used to determine the effective laser field at the metal tip [3]. Based on our experimental and theoretical findings we could show that we coherently control the dynamics of the liberated electronic matter wave with the laser field on sub-cycle, i.e., attosecond time scales.
[1] M. Schenk, M. Krüger, P. Hommelhoff, PRL 105, 257601 (2010)
[2] M. Krüger, M. Schenk, P. Hommelhoff, Nature 475, 78 (2011)
[3] G. Wachter, Chr. Lemell, J. Burgdörfer, M. Schenk, M. Krüger, P. Hommelhoff, to be published