Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 23: Plasmonics and Nanooptics: Structure, Fabrication and Characterization
O 23.11: Talk
Tuesday, March 17, 2015, 13:00–13:15, MA 043
New details about monocrystalline goldflakes for plasmonic applications — •Thorsten Feichtner1, Muhammad Bashouti1, Björn Hoffmann1, Achmed Salaheldin2, Mirza Mačković3, Christel Dieker3, Peter Richter4, Ovidiu Gordan4, Dietrich Zahn4, Erdmann Spieker3, and Silke Christiansen1,5 — 1Max Planck Institute for the Science of Light (MPL), 91058 Erlangen, Germany — 2Universität Erlangen-Nürnberg, Institute of Particle Technology, 91058 Erlangen, Germany — 3Universität Erlangen-Nürnberg, Center for Nanoanalysis and Electron Microscopy (CENEM), 91058 Erlangen, Germany — 4Semiconductor Physics, Technische Universität Chemnitz, 09107 Chemnitz, Germany — 5Helmholtz Centre Berlin for Materials and Energy (HZB), 14109 Berlin, Germany
Wet-chemical synthesis of nm-thin, large area gold flakes is a viable method to realize a flat, monocrystalline raw material for fabricating high quality plasmonic devices. Transmission electron microscopy (TEM) proved the gold flakes being single crystalline except for twin boundary formation parallel to the flake surface. Micro-ellipsometry allowed to determine their complex dielectric constant for the first time. The flakes were polished by focused ion beam (FIB) milling and analyzed with electron backscatter diffraction (EBSD). The gold flakes remain monocrystalline down to a thickness of ≈10 nm allowing state-of-the-art nanofabrication processing to obtain nano-antennas or other desired plasmonic structures at sizes and structure perfections impossible with evaporated, poly-crystalline gold thin films.