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O: Fachverband Oberflächenphysik
O 14: Plasmonics and Nanooptics II: Light-Matter Interaction and Spectroscopy
O 14.5: Talk
Monday, March 18, 2024, 16:15–16:30, MA 042
Tuning Disorder-Driven Localization of Plasmons in Random Assemblies of Gold Nanoparticles — •Mohammed Fayis Kalady1,2, Johannes Schultz1, Kristina Weinel1,3, Daniel Wolf1, and Axel Lubk1,4 — 1Leibniz Institute for Solid State and Materials Research (IFW) Dresden, Helmholtzstraße 20, 01069 Dresden, Germany — 2Indian Institute Of Technology (IIT) Delhi, Hauz Khas, New Delhi, Delhi 110016, India — 3Federal Institute of Materials Research and Testing (BAM), Unter den Eichen 87, 12205 Berlin, Germany — 4Institute of Solid State and Materials Physics, Dresden University of Technology, Haeckelstraße 3, 01069 Dresden, Germany
It is well-known that assemblies of plasmonic NPs support hybridized modes of localized surface plasmons, which delocalize in geometrically well-ordered arrangements. Here, we study the hybridization behaviour in geometrically completely disordered systems of Au NPs fabricated by a newly developed e-beam synthesis method that facilitates the production and arrangement of NPs of different sizes and distances. Employing state-of-the-art STEM Electron Energy Loss Spectroscopy in combination with numerical simulations, we reveal the spatial and spectral distribution of the coupled LSP modes. We show, amongst others, that their disorder-driven localization behaviour crucially depends on the thickness of NPs, exhibiting a transition in the energy dependence of the localization at a critical thickness of about 10 nm. Employing numerical simulations, we discuss this behaviour with respect to the size and distance distribution of the NPs.
Keywords: Plasmonics; Nanoparticles; Plasmon localization; EELS