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A: Fachverband Atomphysik

A 26: Poster: Atomic systems in external fields

A 26.10: Poster

Mittwoch, 14. März 2012, 16:30–19:00, Poster.V

Phase-controlled electron acceleration from metal clusters in few-cycle laser pulses — •Lennart Seiffert, Jörg Köhn, and Thomas Fennel — Universität Rostock, 18051 Rostock, Germany

It is well-known that the ionization of 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 to unravel and control ionization processes in more complex many particle systems, such as silica nanoparticles [2]. Here we investigate the phase controlled electron acceleration from laser driven metal clusters, where the resonant excitation of Mie-plasmons leads to extreme field enhancement. Angular- and energy resolved electron spectra are calculated for resonant jellium-like clusters using a semiclassical Vlasov approach [3]. We observe a strong phase dependence of the electron spectra, with pronounced left-right asymmetry in the energy distribution of electrons emitted parallel to the laser polarization axis. A detailed analysis of the electron trajectories allows the identification of the leading acceleration mechanisms and supports the dominant role of surface plasmon assited rescattering in clusters (SPARC) [3]. A systematic analysis of the phase effects as function of the laser pulse duration is presented.

[1] G. G. Paulus et al., Phys. Rev. Lett. 91, 253004 (2003)

[2] S. Zherebtsov et al., Nature Phys. 7, 656 (2011)

[3] Th. Fennel et al., Phys. Rev. Lett. 98, 143401 (2007)