Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 56: Plasmonics and nanooptics: Light-matter interaction, spectroscopy IV
O 56.4: Vortrag
Mittwoch, 14. März 2018, 11:15–11:30, MA 041
Two-dimensional properties of thin single-crystalline gold films — Swen Grossmann1, •Daniel Friedrich1, Michael Karolak2, René Kullock1, Enno Krauss1, Monika Emmerling1, Giorgio Sangiovanni2, and Bert Hecht1 — 1NanoOptics & Biophotonics Group, Experimental Physics 5, University of Würzburg, Germany — 2Theoretical Physics 1, University of Würzburg, Germany
Gold nanostructures such as nanowires can strongly enhance and confine optical fields while also providing excellent electronic contacts to functional elements.[1] Films of single-crystaline gold ensure well-defined experimental conditions for precision metrology and sensing.[2] In all these cases the electronic properties of gold either affect the functionality or the interpretation of experimental findings.
Here, we report notable changes in the electronic structure of gold occurring already for film thicknesses of 30nm by studying atomically flat 2D single-crystal gold platelets of variable thickness. When the gold thickness reduces below 30nm deviations from bulk electronic properties reveal themselves in a 100-fold increase of the nonlinear two-photon photoluminescence signal. Our findings are supported by density functional theory calculations and also allow us to optically resolve single-unit-cell steps.
[1] J. Kern et al., Nat Photon 9, 9 (2015)
[2] J.-S. Huang et al., Nat Comm 1, 150 (2010)