Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 10: Atomic systems in external fields
A 10.3: Vortrag
Montag, 17. März 2014, 14:45–15:00, BEBEL E44/46
Sub-cycle control of photoelectron emission from metal clusters exposed to intense bichromatic laser pulses — •Dzmitry Komar1, Johannes Passig1, Sergei Zherebtsov2, Robert Irsig1, Mathias Arbeiter1, Christian Peltz1, Frederik Süssmann2, Slawomir Skruszewicz1, Matthias Kling2, Thomas Fennel1, Josef Tiggesbäumker1, and Karl-Heinz Meiwes-Broer1 — 1Universität Rostock, Universitätsplatz 3, 18051 Rostock — 2Max-Planck Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching
Collective electron motion induces strong polarization fields in metal clusters when exposed to intense optical pulses. Highly charged and energetic species are generated by resonant excitation of the cluster plasmon mode via an optimized pump-probe sequence. We conducted pump-probe experiments on nm-sized silver metal clusters applying bichromatic (ω-2ω) pulses of 1014 W/cm2 to probe the nanoplasma. A field-free time of flight spectrometer allows to resolve energetic (up to 100 Up) electron emission in opposite directions along the laser polarization axis. By using the ω-2ω technique, the dependence of the directional emission with respect to phase differences between red and blue spectral parts of the probe pulse has been studied. Strong anisotropies of re-scattered electrons have been obtained allowing to control energetic electron emission on a sub-cycle time scale.