Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 33: Interaction with strong and short laser pulses

A 33.8: Poster

Donnerstag, 14. März 2019, 16:15–18:15, S Fobau Physik

Nanoscale vacuum-tube-typed electronic devices triggered by few-cycle laser pulses — •Constanze Sturm, Takuya Higuchi, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen

Electron pulses from a sharp needle tip triggered by ultrashort laser pulses via multiphoton photoemission are extremely confined both in space and time. Employing these electrons as carriers in electronic devices may drastically improve their operational speed.

We present an experiment based on two lithographically fabricated gold tips on top of a fused silica substrate. The two tips facing each other are separated by a fixed distance set between 30 nm and 2 µm. The final tip radius depends on the opening angle chosen for the tips and the dose parameter of the lithography process. Optimizing both results in a minimum tip radius of 15 nm.

In the experiment two tips with different tip radii are illuminated by 6 fs Ti:sapphire laser pulses. Measuring the total current results in a non-vanishing current from the sharper tip to the blunter one. This can be explained by numerical simulations showing a stronger optical near-field enhancement at the sharper tip, resulting in a stronger electron emission. Our goal is to control the electron emission by changing the static field landscape, the incident laser power and the light polarization.