Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 64: Nano-Optics III
Q 64.3: Vortrag
Freitag, 4. März 2016, 11:30–11:45, f342
Above threshold ionization of Rydberg electrons localized to a gold nanotip — •Jörg Robin1, Jan Vogelsang1, Benedek J. Nagy2, Petra Groß1, and Christoph Lienau1 — 1Carl von Ossietzky Universität, 26129 Oldenburg — 2Wigner Research Centre for Physics, H-1121 Budapest
Metallic nanotips are model systems to study nanometre and femtosecond electron dynamics and provide the possibility for ultrafast electron microscopy. Evidence of strong-field phenomena has been observed by one-colour photoemission of electrons from metallic nanotips [1-3], while two-colour photoemission has established the existence of surface states on metallic films [4]. Here, we report femtosecond two-colour photoemission of electrons from a gold nanotip. We observe long-lived wave packets of Rydberg electrons bound to their own image potential. These intermediate bound states facilitate above-threshold ionization similar to atomic systems and give access to a cold, ultrafast, nanolocalized electron source. [1] Krüger, M. et al. Nature 475, 78 (2011) [2] Herink, G. et al. Nature 483, 190 (2012) [3] Piglosiewicz, B. et al. Nat. Photon. 9, 37 (2014) [4] Höfer, U. et al. Science 277, 1480 (1997)