Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 9: Interaction with strong or short laser pulses I
A 9.1: Hauptvortrag
Montag, 18. März 2013, 16:30–17:00, B 305
Attosecond physics at a nanoscale metal tip — •Peter Hommelhoff2,1, Michael Krüger1, Michael Förster1, Sebastian Thomas1, Lothar Maisenbacher1, Peter Dombi1, Johannes Hoffrogge1, Jakob Hammer1, Dominik Ehberger1, John Breuer1, Georg Wachter3, Christoph Lemell3, and Joachim Burgdörfer3 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching — 2Physik-Department, Universität Erlangen-Nürnberg, Erwin-Rommel-Str. 1, 91058 Erlangen — 3Theoretische Physik, TU Wien, Wiedner Hauptstraße 8-10, A-1040 Wien
We focus few-cycle laser pulses onto sharp metal tips. Electrons are emitted from the apex of the tip, and their energy is analysed. We observe a strong carrier-envelope phase (CEP) dependence and can switch on and off the high-energy part of the electron current by the CEP. We can describe the spectra with the three-step model borrowed from high-harmonic generation in atomic gases. Because of the broken symmetry in tip-based experiments, the spectra can be explained with few trajectories only, alleviating their interpretation. We will compare the spectra to more appropriate TDDFT simulation results and will report on ongoing experiments focusing on understanding the interaction of few-cycle laser pulses and nanoscale matter on sub-fs time scales.