SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 49: Plasmonics and Nanooptics I: Fabrication and Application
O 49.5: Vortrag
Mittwoch, 29. März 2023, 11:30–11:45, WIL A317
Plasmonics of Silica Encapsulated Au@Ag Nanoparticles — •Johannes Schultz1, Felizitas Kirner2, Pavel Potapov1, Bernd Büchner1,3, Axel Lubk1,3, and Elena Sturm2 — 1Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e. V., Helmholtzstraße 20, 01069 Dresden — 2Department of Chemistry, University of Konstanz, Universitätsstraße 10, 78457 Konstanz — 3Institute of Solid State and Materials Physics, Haeckelstraße 3, 01069 Dresden
Localized Surface Plasmons (LSPs) are collective charge oscillations arising at interfaces between media of opposite sign of the corresponding dielectric functions. Here, spatial confinement of the LSPs, e.g. in nanoparticles (NPs), may lead to resonant amplification of the corresponding electromagnetic (e.m.) fields. This effect is exploited in several application, e.g., surface enhanced Raman spectroscopy or plasmonic solar cells. Depending on the application, this requires specific control of the spectral positions of the LSPs. Since the latter depend on both, the dielectric function of the NP and the surrounding, tuning of the LSPs can be realized by varying the dielectric environment of the NP. Here, a novel synthesis method was used to encapsulate silver nanocubes with silica layers of uniform and adjustable thickness in the range between 8 and 22 nm to tune the dielectric environment and hence the excitation energies of the LSPs with high precision over a broad spectral range between 2.55 and 3.25 eV. Furthermore, resonant coupling between Mie-type resonances at the silica-vacuum interface and the LSPs was found which leads to an e.m. field enhancement in the range of 100 %.