Regensburg 2019 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Nanomaterials
MM 17.8: Vortrag
Dienstag, 2. April 2019, 12:15–12:30, H46
Towards plasmonic tunnel gaps for nanoscale photoemission currents by on-chip laser ablation — Philipp Zimmermann1,2, •Alexander Hötger1, Noelia Fernandez1, Reinhard Kienberger3,4, and Alexander Holleitner1,2 — 1Walter Schottky Institute and Physics Department, Technical University of Munich, Am Coulombwall 4a, 85748 Garching, Germany — 2Nanoinitiative Munich (NIM), Schellingstr. 4, 80799 München, Germany — 3Physics Department E11, Technical University of Munich, James-Franck-Str. 1, 85748 Garching, Germany — 4Max-Planck-Institute für Quantenoptik, Hans Kopfermann-Straße 1, 85748 Garching, Germany
We demonstrate that prestructured metal nanogaps can be shaped on-chip to below 10 nm by femtosecond laser ablation. We explore the plasmonic properties and the non-linear photocurrent characteristics of the formed tunnel junctions. The photocurrent can be tuned from multi-photon absorption towards the strong-field tunneling regime in the nanogaps. We demonstrate that a unipolar ballistic electron current is achieved by designing the plasmonic junctions to be asymmetric, which allows ultrafast electronics on the nanometer scale.