Regensburg 2022 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 35: Nanomaterials: Structure & Properties
MM 35.9: Vortrag
Donnerstag, 8. September 2022, 18:00–18:15, H46
Maximal Anderson Localization and Suppression of Surface Plasmons in Two-Dimensional Random Au Networks — •Johannes Schultz1, Karl Hiekel2, Pavel Potapov1, Pavel Khavlyuk2, Alexander Eychmüller2, and Axel Lubk1 — 1Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstraße 20, 01069 Dresden, Germany — 2Chair of Physical Chemistry, TU Dresden, Zellescher Weg 19, 01069 Dresden, Germany
2D random metal networks possess unique electrical and optical properties, such as almost hundred percent optical transparencies and low sheet resistance, which are closely related to their disordered structure and may be exploited in various applications. Here we present a detailed experimental and theoretical investigation of their plasmonic properties, revealing Anderson (disorder-driven) localized surface plasmon (LSP) resonances of large quality factors and spatial localization close to the theoretical maximum. The LSPs typically consist of multiple field hotspots with a well-defined correlation distance. Moreover, they disappear above a geometry-dependent threshold at ca. 1.6 eV in the investigated networks, explaining their large transparencies in the optical spectrum. Electron energy loss spectroscopy in combination with scanning transmission electron microscopy was applied for the experimental studies. Both, the high spatial (≈1 nm) and spectral (≈50 meV) resolution allows to study the variety of LSP modes in terms of excitation energy and spatial localization. The theoretical study is based on a coupled dipole model, which allows modeling of large plasmonic systems by exploiting Babinet’s principle.