Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 10: Ultrakurze Laserpulse: Anwendungen
Q 10.5: Talk
Monday, March 12, 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 [3]. It enables by comparison to extract the enhanced intensity at the nanometric tip and compare it to simulations of field enhancement [4]. Most recent results will also be discussed.
[1] M. Krüger, M. Schenk, P. Hommelhoff, Nature 475,78 (2011)
[2] M. Schenk, M. Krüger, P. Hommelhoff, PRL 105, 257601 (2010)
[3] G. Wachter et al., manuscript in preparation
[4] see also contribution of Sebastian Thomas et al.