Stuttgart 2012 – wissenschaftliches Programm
Q 10.5: Vortrag
Montag, 12. März 2012, 15:00–15:15, V38.01
Electron Rescattering effects in photoemission from a nanoscale metal tip — •Markus Schenk1, Michael Krüger1, Georg Wachter2, Christoph Lemell2, Joachim Burgdörfer2, Michael Förster1, Sebastian Thomas1, Lothar Maisenbacher1, and Peter Hommelhoff1 — 1Max-Planck-Institut für Quantenoptik, Garching bei München, Germany — 2Institut für Theoretische Physik TU Wien, Austria
We show experimental and theoretical investigations of electron rescattering effects in photoemission induced by few-cycle laser pulses from metal nanotips. At nearfield-enhanced light intensities exceeding ∼ 1012 W/cm2 a pronounced plateau structure builds up in the high-energy part of the electron spectra. Similar to strong-field experiments with atomic gases, this plateau can be understood in terms of light-field governed electron motion controlled on the sub-fs timescale [1,2]. In a simplistic picture, the electron undergoes classical-particle like propagation after emission and scatters elastically at the metal surface.
A more sophisticated solid-state modelling with time-dependent density functional theory (TDDFT) supports this notion . It enables by comparison to extract the enhanced intensity at the nanometric tip and compare it to simulations of field enhancement . Most recent results will also be discussed.
 M. Krüger, M. Schenk, P. Hommelhoff, Nature 475,78 (2011)
 M. Schenk, M. Krüger, P. Hommelhoff, PRL 105, 257601 (2010)
 G. Wachter et al., manuscript in preparation
 see also contribution of Sebastian Thomas et al.