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Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 18: Attosecond physics I

A 18.6: Vortrag

Dienstag, 13. März 2012, 15:45–16:00, V47.03

Attosecond plasma wave dynamics in laser-driven cluster nanoplasmas — •Christian Peltz1, Charles Varin2, Thomas Brabec2, and Thomas Fennel11Institute of Physics, University of Rostock, Germany — 2Department of Physics and Centre for Photonics Research, University of Ottawa, Canada

Molecular dynamics (MD) and particle-in-cell (PIC) methods have been used with great success for modeling intense laser-plasma interaction, though both have certain important limitations. Electrostatic MD works well for small nanoplasmas, where the dipole approximation and the neglect of field propagation are justified. PIC codes average over the fine-grained atomic structure and thus neglect collisions and plasma microfields which is only justified at relativistic intensities or in weakly coupled plasmas and makes the treatment of large plasma volumes possible. We introduce a novel microscopic particle-in-cell (MicPIC) method that overcomes the above limitations with a P3M-type force decomposition. In MicPIC, long-range electromagnetic interactions are described on a PIC level, on which particles are represented by wide Gaussian distributions on a relatively coarse numerical grid. When two particles come close, the PIC field is replaced by the analytic electrostatic field to resolve microscopic (Mic) interactions. As a first application, we study the resonant excitation of metal-like clusters (Mie plasmon and laser in resonance) where we found plasma waves in surprisingly small clusters at moderate laser intensities (<1014 W/cm2). A detailed analysis of the wave dynamics and its impacct on absorption and ionization will be presented[submitted].

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