Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster Session II

A 26.25: Poster

Mittwoch, 8. März 2017, 17:00–19:00, P OG1

Optical control of electron emission direction at a gold nanotip on a chip — •Constanze Sturm, Takuya Higuchi, Peyman Yousefi, Christian Heide, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen

Electron pulses from a sharp metal nanotip triggered by ultrashort laser pulses via multiphoton and above-threshold photoemission are extremely confined both in space and time. Employing these short-pulsed electrons as carriers in electronic devices may drastically improve their operation speed [1]. We propose and demonstrate an experiment to steer the electron emission direction at two dimensional nanotips fabricated with lithography on top of a substrate. This is achieved by illuminating the tip with a pair of two laser pulses with orthogonal polarizations. By tuning the relative delay between the two pulses, we change the near-field distribution at the surface of the tip, resulting in a modification of the electron emission sites on the tip. The resultant shift in emission direction is measured as a current difference of two detecting electrodes.

Numerical simulations and the current status of the experiment will be presented.

[1] T. Higuchi et al., Appl. Phys. Lett. 106, 051109 (2015).

[2] H. Yanagisawa et. al., Phys. Rev. Lett. 103, 257603 (2009).