Microellipsometrische Untersuchungen geordneter plasmonischer Nanostrukturen

01/01/2019 to 31/12/2022

This project is devoted to the investigation of ordered plasmonic nanostructures by angle-resolved extinction spectroscopy and imaging spectro-ellipsometry with high spatial resolution. Cylindrical nanoparticles are arranged in ordered lattices on a spacer separating those particles from an additional metallic layer (so-called metal-insulator-metal (MIM) structures). Such a system has a variety of electromagnetic resonances, spectral and geometrical position of which may be tuned besides the used materials by the geometrical parameters of the constituting nanoparticles, the lattice parameters, and the thickness of the spacer. The use of extinction and imaging ellipsometry at different angles of incidence will allow both longitudinal and transverse resonances of the system to be excited and separated, revealing individual, lattice, and cooperative resonances as well as providing not only amplitude but phase information.