Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics V
Q 62.87: Poster
Donnerstag, 8. März 2018, 16:15–18:15, Redoutensaal
Two-color coherent control at a nanotip: from above-threshold photoemission to spectroscopy on a metallic surface — •Ang Li1, Timo Paschen1, Michael Förster1, Michael Krüger1, Florian Libisch2, Chritoph Lemell2, Georg Wachter2, Thomas Madlener2, Joachim Burgdörfer2, and Peter Hommelhoff1 — 1Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstr. 1, 91058 Erlangen — 2Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10/E136, 1040 Wien
Nanotips are routinely used as electron sources in high-resolution electron microscopes [1] and as a basis for studying strong-field phenomena at the surface of solids [2]. When these tips are excited with a fundamental femtosecond laser field and its second harmonic one can coherently control the electronic dynamics on the (sub-) femtosecond time scale. Here, we report on such laser-triggered electron emission studied as a function of pulse delay, optical near-field intensities, dc bias field and final photoelectron energy. Further, a spectroscopy of this coherent signal is presented based on a variation of the wavelength of the two laser fields, revealing a new method of studying the electronic properties of surfaces of different materials. The experimental results are discussed in the framework of quantum-pathway interference supported by local density of states simulations.
[1] A. V. Crewe et al., Rev. Sci. Instrum. 39, 576 (1968).
[2] R. Bormann et al., Phys. Rev. Lett. 105, 147601 (2010).