Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Plasmonics and Nanooptics V
O 63.10: Vortrag
Donnerstag, 14. März 2013, 12:45–13:00, H38
Optical antennas for ultrafast spectroscopy of single CdSe nanoobjects — •Thorsten Schumacher1,2, Daniela Ullrich1,2, Mario Hentschel1,2, Harald Giessen2, and Markus Lippitz1,2 — 1Max Planck Institute for Solid State Research, Stuttgart — 24th Physics Institute, University of Stuttgart
Ultrafast nonlinear spectroscopy investigates the deviations from linear light-matter interaction on very short timescales. The already weak nonlinear signals are reduced further when single nanoobjects such as quantum dots, molecules, or nanoparticles are the systems of interest. We present a method to resolve ultrafast carrier dynamics of excitonic states in an individual CdSe nanowire. We observe various fast and long living effects in the transient absorption spectra that we attribute to a highly excited electron-hole plasma and excitonic state bleaching. To enhance this nonlinear response we developed a method to place gold nanoantennas in close vicinity to the nanowires. Here we present first experimental results of these hybrid systems.