Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.98: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

Detecting Harmonic Generation from a Metal Nanotip — •Ella Schmidt, Michael Förster, Timo Paschen, and Peter Hommelhoff — Lehrstuhl für Laserphysik, Department Physik, FAU Erlangen-Nürnberg

Strong-field photoemission from metal nanotips has recently been studied intensively (see eg [1],[2]). In the resulting energy spectrum of the emitted electrons a plateau region can be observed due to rescattering. In the analogous atomic case, electrons that are driven back to the parent ion can also recombine, leading to high harmonic generation. Here, we explore the possibility of harmonic generation at metal tips, where second harmonic generation has previously been observed [3].

We present a setup that enables the observation of harmonic generation from a metal nanotip. 6-fs laser pulses from a Titanium:sapphire laser oscillator are focused on a sharp tungsten nanotip and the harmonics are observed with a photomultiplier.

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

[2] G. Wachter et al., Phys. Rev. B 86, 035402 (2012).

[3] A. Bouhelier et al. Phys. Rev. Lett. 90, 013903 (2003).