Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 33: Nanostructures at Surfaces III

O 33.7: Vortrag

Dienstag, 12. März 2013, 12:00–12:15, H45

Electron motion in few-cycle laser field around metallic nanostructures — Björn Piglosiewicz, Slawa Schmidt, Doojae Park, Jan Vogelsang, •Petra Groß, and Christoph Lienau — Ultraschnelle Nano-Optik, Institut für Physik, Universität Oldenburg, 26111 Oldenburg

Sharp metallic nanotips irradiated with few-cycle laser pulses are promising candidates as sources of highly confined electron wavepackets of short temporal duration and high spatial directivity. Specifically the strong-field regime, where electron emission by tunneling becomes dominant over multi-photon and above-threshold ionization, enables the generation of (sub-)femtosecond electron wavepackets. For sufficiently long wavelengths and short pulses, electrons are accelerated to escape the near field within one half-cycle of the laser oscillation [1,2].

Here, we study for the first time the effect of the carrier envelope phase of few cycle laser pulses on the motion of electrons emitted from metallic nanostructures by strong-field tunneling. Sharp gold tips are illuminated with CEP-stable few-cycle near-IR pulses at 1.5 µm and the kinetic energy spectra of the emitted electrons are recorded. We observe pronounced modifications of the photoelectron spectra when varying the CEP phase. Our results, explained within a modified Simpleman model, shed new light on the light-driven motion of electrons in the near field of metallic nanostruuctures on sub-femtosecond time scales.

[1] G. Herink et al., Nature 483, 190 [2012]

[2] D. J. Park et al., Phys. Rev. Lett., in press (2012)