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O: Fachverband Oberflächenphysik
O 65: Plasmonics and Nanooptics IV: Waveguides and Antennas
O 65.8: Vortrag
Mittwoch, 18. März 2020, 12:15–12:30, WIL A317
Generating ultra-narrow gaps in bow-ties utilizing break junctions — •Florian Laible1, Kai Braun2, Martin Eberle2, Dieter P. Kern1, Alfred J. Meixner2, and Monika Fleischer1 — 1Institute for Applied Physics and Center LISA+, University of Tübingen, 72076, Tübingen, Germany — 2Institute for Physical and Theoretical Chemistry and Center LISA+, University of Tübingen, 72076, Tübingen, Germany
Investigations on the interplay of localized plasmonics and electron tunneling require electrically contacted dimer nanoantennas with ultra-narrow, i.e. sub-1 nm, gaps. The realization of this configuration is a challenging task. It has been achieved in [1], but this experiment is hardly suitable for more general investigations.
We present an alternative approach to reach ultra-narrow gaps in the focus of a confocal microscope. Gapless bow-tie antennas are integrated into mechanically controllable break junctions. The nanostructures are optically decoupled from the electrical leads. The gap is created by bending the substrate. Its size is measured (in situ) using the tunnel effect and controlled by increasing or decreasing the bending of the substrate.
Due to the decoupling of the nanostructures from the leads, localized plasmon polaritons are excited in the bow-tie when illuminated by the laser of a confocal microscope. Combined electrical and optical measurements will be presented alongside with the fabrication process.
[1] K. J. Savage, et al. Nature, 491(7425),574, 2012.