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O: Fachverband Oberflächenphysik
O 82: Plasmonics and Nanooptics: Fabrication, Characterization and Applications II
O 82.7: Vortrag
Donnerstag, 20. März 2025, 12:00–12:15, H8
Disorder-driven localization of surface plasmon resonances in disordered assemblies of gold nanoparticles — •Kristina Weinel1,2,3, Johannes Schultz1, Mohammed Fayis Kalady1, Daniel Wolf1, Leonardo Agudo Jácome3, and Axel Lubk1,2 — 1Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Dresden, Germany — 2Technical University Dresden (TUD) Dresden, Dresden, Germany — 3Federal Institute of Materials Research and Testing (BAM), Berlin, Germany
The general wave phenomenon of Anderson localization, which is the absence of diffusion of waves in disordered systems, is studied for surface plasmon waves in two-dimensional disordered systems. To that end disordered assemblies of plasmonic gold nanoparticles (NPs) on an insulating silicon oxide substrate were synthesized by a newly developed synthesis method where an electron beam in a scanning electron microscope is used to heat a gold microparticle precursor until evaporation and deposition of the gold atoms on the substrate forming NPs of varying sizes. To reveal the surface plasmons and their localization behavior, electron energy loss spectroscopy in the transmission electron microscope is applied and compared with self-consistent dipole model simulations. Disorder-driven spatial and spectral localization of the hybridized localized surface plasmon modes was found experimentally and via simulation. Moreover, the localization exhibits a characteristic thickness dependency determining the localization length dependency on the plasmon energy.
Keywords: Disorder-driven localization; Surface plasmons; Disordered assemblies of gold nanoparticles; Electron energy loss spectroscopy; Self-consistent dipole model