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HL: Fachverband Halbleiterphysik

HL 30: Heterostructures, interfaces, and surfaces

HL 30.6: Talk

Wednesday, March 14, 2018, 16:30–16:45, EW 202

Fluorescence behaviour of semiconductor nanoparticles in vicinity of plasmonic metals — •Simon Schneider, Phillip Witthöft, Jannik Rebmann, Tobias Kipp, Christian Strelow, and Alf Mews — Institut für Physikalische Chemie, Universität Hamburg, Grindelallee 117, 20146 Hamburg, Germany

Interactions of plasmonic metal nanoparticles with semiconductor nanoparticles greatly influence the fluorescence behaviour of the latter. If introduced to a plasmonic resonant system, the rate of spontaneous emission can be enhanced (Purcell effect). Here, the distance between the metal- and semiconductor nanoparticles, as well as the geometry of the system, has a huge influence on the fluorescence behaviour of the whole system, i.e. direct contact of the two parts leads to complete fluorescence quenching. We control the distance between plasmonic metals and CdSe/CdS semiconductor dot-in-rod (DR) structures on a nanometer scale using a silica shell around the DRs as a dielectric spacer and investigate the effect of attached plasmonic metals (Ag & Au) on the fluorescence behaviour of the DRs. By using different geometries (i.e. spherical nanoparticles or nanorods) we can tune the spectral overlap as well as the dispersion of the electric field generated through the surface plasmon resonances, thereby influencing the fluorescence behaviour of the system.