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Q: Fachverband Quantenoptik und Photonik

Q 61: Ultrashort Laser Pulses II

Q 61.6: Talk

Thursday, March 26, 2015, 15:45–16:00, K/HS2

Time-resolved two-color laser-induced photoemission from a metal nanotip in the infrared — •Timo Paschen, Michael Förster, Michael Krüger, Sebastian Thomas, and Peter Hommelhoff — Lehrstuhl für Laserphysik, Department Physik, Friedrich- Alexander Universität Erlangen-Nürnberg, Staudtstr. 1, 91058 Erlangen

By focusing femtosecond laser pulses on an ultrasharp metal tip it is possible to trigger laser-induced electron emission in the strong-field regime [1] due to field enhancement in the vicinity of the tip apex. Since the emission dynamics are highly dependent on the temporal form of the laser field [2] we investigate electron emission from a single crystal tungsten tip using an asymmetrically synthesized waveform consisting of two different laserfields. For our experiments a spectrally broadened erbium-doped fiber laser system [3] is used. We show time-resolved dynamics of laser-induced photoemission dependent on the relative phase between ultrashort infrared laserpulses and their second harmonic.

[1] M. Schenk et al., Phys. Rev. Lett., 105, 257601 (2010).

[2] M. Krüger et al., Nature 475, 78 (2011).

[3] S. Thomas et al., Optics Express 20, 13663 (2012).