Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 23: Poster: Atomic clusters (with MO)

A 23.4: Poster

Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais

Microscopic description of single-shot diffractive imaging of clusters via the dyadic Green’s function approach — •Katharina Sander, Christian Peltz und Thomas Fennel — Institute of Physics, University of Rostock

The availability of intense femtosecond laser pulses in the XUV and soft X-ray regime from free-electron lasers (FELs) has made it possible to investigate the structure and dynamics of nanosystems via single-shot diffractive imaging experiments, as recently demonstrated with single clusters [1]. However, standard Mie theory is not applicable to model the scattering of non-spherical systems. Therefore, a more general microscopic approach has been developed, that describes light scattering of clusters on an atomic level via dyadic Green’s functions. This method can be applied to arbitrary cluster shapes and to strong non-equilibrium states such as internal plasmonic excitation of cluster electrons. As a first application of this model we examine the possibility to image the recently predicted internal plasma waves in clusters induced by a short infrared laser pulse [2]. Our analysis supports, that the ultrafast dynamical movement of the plasma waves can be extracted from the time-resolved scattering pictures. As a second scenario, we investigate the scattering of strongly absorbing silver clusters. For strongly non-spherical geometries the effect of absorption is analyzed by comparing the full Green’s function solution to the result of the first Born approximation.

[1] T. Gorkhover et al., Phys. Rev. Lett. 108, 245005, (2012)

[2] C. Varin et al., Phys. Rev. Lett. 108, 175007, (2012)