Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 45: Atomic systems in external fields I
A 45.3: Vortrag
Freitag, 22. März 2013, 11:45–12:00, B 302
Phase-controlled electron acceleration from dielectric nanoparticles in intense few-cycle laser pulses — •Lennart Seiffert1, Frederik Süßmann2, Sergey Zherebtsov2, Jürgen Plenge3, Eckart Rühl3, Matthias Kling2, and Thomas Fennel1 — 1Universität Rostock, 18051 Rostock, Germany — 2Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 3Freie Universität Berlin, 14195 Berlin, Germany
The electron emission from atoms and molecules in intense few-cycle laser pulses can be precisely controlled (with sub-fs resolution) by the carrier-envelope-phase [1]. Recently, it has been shown that such pulses also allow us to unravel and control ionization processes in more complex many particle systems, such as silica nanoparticles [2]. Here, we investigate the electron acceleration from laser driven dielectric nanoparticles, where near-field enhancement at the surface leads to the emission of high energy electrons. The electron dynamics is modelled using a quasi-classical trajectory-based mean field Monte-Carlo approach [3], which is extended to account for propagation effects of the near-fields. The size-dependent structure of the near-fields results in strong changes of the angular resolved electron spectra for particle diameters in the range 100−400 nm. A detailed understanding of the contributing emission procceses, such as direct, thermal, and field enhanced emission can be deduced from the electron trajectory analysis.
[1] G. G. Paulus et al., Phys. Rev. Lett. 91:253004 (2003)
[2] S. Zherebtsov et al., Nature Phys. 7:656 (2011)
[3] S. Zherebtsov et al., New J. Phys. 14:075010 (2012)