Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 7: Poster: Atomic systems in external fields

A 7.5: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Impact of subwavelength nanofocussing on the carrier-envelope phase controlled strong-field photoemission from nanospheres — •Lennart Seiffert1, Frederik Süßmann2, Matthias Kling2, and Thomas Fennel11Universität Rostock, Universitätsplatz 3, 18051 Rostock, Germany — 2Max-Planck Institut für Quantenoptik, 85748 Garching, Germany

Localized near-fields at laser-excited nanostructures have opened up a new dimension in attosecond science to enhance, fundamentally modify, and control electronic strong-field processes [1, 2]. Here we consider sub-wavelength nanofocussing in unsupported dielectric nanospheres to generate tailored near-fields and study the resulting strong-field electron dynamics via the angle-resolved photoemission [3]. To further investigate the electron acceleration process we modelled the dynamics using a quasi-classical trajectory-based mean field Monte-Carlo approach, which is extended to account for propagation effects of the near-fields. We demonstrate symmetry breaking and directional controllability of the carrier-envelope-phase dependent emission of recollision electrons due to the propagation-induced near-field deformation. We show that directionality of the photoemission remains largely unaffected by local field ellipticity and nonlinear many-particle charge interaction, even if the latter results in a significant boost of the final electron energies.

[1] M. Krüger et al., Nature 475 (2011)

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

[3] F. Süßmann et al., submitted

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