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O: Fachverband Oberflächenphysik
O 65: Plasmonics and Nanooptics IV: Waveguides and Antennas
O 65.6: Vortrag
Mittwoch, 18. März 2020, 11:45–12:00, WIL A317
Strongly coupled, high-quality plasmonic dimer antennas fabricated using a sketch-and-peel technique — •Moritz Gittinger1, Katja Höflich2, Vladimir Smirnov1, Heiko Kollmann1, Christoph Lienau1, and Martin Silies1 — 1AG Ultrafast Nano-Optics, Carl von Ossietzky University Oldenburg, Germany — 2Helmholtz Zentrum für Materialien und Energie, Berlin, Germany
A combination of helium- and gallium-ion beam milling together with a fast and reliable sketch-and-peel technique is used to fabricate gold nanorod dimer antennas with an excellent quality factor and with gap distances of less than 6 nm. The high fabrication quality of the sketch-and-peel technique compared to a conventional ion beam milling technique is proven by polarization resolved linear dark-field spectromicroscopy of isolated dimer antennas. We demonstrate a strong coupling of the two antenna arms for both fabrication techniques, with a quality factor of more than 14, close to the theoretical limit, for the sketch-and-peel produced antennas compared to only 6 for the conventional fabrication process. The obtained results on the strong coupling of the plasmonic dimer antennas are supported by finite-difference time-domain simulations of the light-dimer antenna interaction. The presented fabrication technique enables the rapid fabrication of large-scale plasmonic or dielectric nanostructures arrays and metasurfaces with single-digit nanometer scale milling accuracy. [https://doi.org/10.1515/nanoph-2019-0379]