Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 20: Focussed Session: Geometry- and Topology-Controlled Nanoarchitectures II

HL 20.2: Talk

Tuesday, March 13, 2018, 14:30–14:45, EW 015

Gold-dye plexcitonic Fano systems — •Carola Kryschi and Johannes Kupka — Friedrich-Alexander University of Erlangen, 91058 Erlangen, Germany

Coherent coupling between surface plasmons of noble-metal nanostructures and molecular excitons may create particular polaritonic modes, the so-called plexcitons. In this contribution we report surface-structure mediated stationary optical properties and ultrafast excitation relaxation dynamics of plexcitonic gold-nanostructure dye nanohybrid systems. Optical excitation of self-organized assemblies of spherical gold nanoparticles and laser dye molecules resulted into the generation of plexcitonic Fano resonances in absorption which manifest the interference between the plasmonic and molecular resonances. Moreover, we could show that spaser emission can be generated by amplifying longitudinal surface plasmon modes in gold nanorods by optically pumping surface-attached resonantly-coupled laser dyes.