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O: Fachverband Oberflächenphysik

O 23: Plasmonics and Nanooptics: Structure, Fabrication and Characterization

O 23.11: Vortrag

Dienstag, 17. März 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 Christiansen^1,5 — 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.