Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.55: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

Nanoscale vacuum-tube electronic devices triggered by few-cycle laser pulses — •Constanze Sturm, Takuya Higuchi, Peyman Yousefi, Christian Heide, Kristof Kremer, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstrasse 1, 91058 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 such short-pulsed electrons as charge carriers in electronic devices may drastically improve their operation speed. As a first step, we demonstrate a nanoscale diode device triggered by few-cycle laser pulses [1]. While focusing the laser on two tips facing each other and separated by a few hundreds of nanometers, we exploit the dependence of the near-field optical enhancement on the tip radius. This dependence results in a photoemission yield that is larger for the sharper tip compared to the blunter one. As a consequence the laser-triggered current between two tips exhibits a rectifying behavior. For a systematic variation of the tip radii and a reliable control of the distance between the tips, we lithographically fabricated tips on top of a substrate. The current status of the experiments will be presented.

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