Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 81: Post-Deadline Session

O 81.2: Vortrag

Donnerstag, 14. März 2013, 20:15–20:30, H36

Carrier-envelope phase effects on strong-field emitted electrons from gold nanotips — •Petra Groß, Björn Piglosiewicz, Slawa Schmidt, Doojae Park, Jan Vogelsang, and Christoph Lienau — Ultraschnelle Nano-Optik, Institut für Physik, Universität Oldenburg, 26111 Oldenburg

We report on the first experimental observation of pronounced carrier-envelope phase (CEP) effects on strong-field photoemission of electrons from nanometric gold tips. We believe that this is an important step towards the steering and control of the motion of electrons around metallic nanoparticles on nanometer length and attosecond time scales.

Sharp metallic nanotips irradiated with few-cycle laser pulses are sources of highly confined electron wavepackets of short temporal duration and high spatial directivity [1]. This is the case especially in the strong-field regime, where electron emission by tunneling becomes dominant over multi-photon and above-threshold ionization. For sufficiently long laser wavelengths and short pulses, electrons are accelerated to escape the near field within one half-cycle of the laser oscillation. In this case, the motion of the field-emitted electrons should be sensitive to the phase of the driving light field. We have experimentally studied the CEP effect by illuminating sharp gold tips with near-infrared light generated by a CEP-stable noncollinear optical parametric oscillator and recording the kinetic energy spectra of the emitted electrons.

[1] B. Piglosiewicz et al., Nature Photonics, under review (2013)