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O: Fachverband Oberflächenphysik
O 11: Ultrafast and Nonlinear Plasmonics
O 11.3: Talk
Monday, March 16, 2015, 15:30–15:45, MA 004
Transient absorption spectroscopy on gold nanorods coated with molecular J-aggregates — •Thomas Simon1,2, Dzimitry Melnikau3, Alexander Urban1,2, Jochen Feldmann1,2, and Yury Rakovich3 — 1Chair for Photonics and Optoelectronics, Ludwig-Maximilians-Universität München, Amalienstr. 54, 80799 Munich, Germany — 2Nanosystems Initiative Munich (NIM), Schellingstr. 4, 80799 Munich, Germany — 3Centro de Física de Materiales (MPC, CSIC-UPV/EHU), Donostia International Physics Center (DIPC), Po Manuel de Lardizabal 5, Donostia-San Sebastian 20018, Spain
We have performed femtosecond transient absorption spectroscopy on cyanine based molecular J-aggregates covering the surface of gold nanorods. By changing the aspect ratio of the rods or choosing J-aggregates with different HOMO-LUMO transition energies, the coupling between excitonic and plasmonic resonances can be tuned and controlled. We have analyzed the nonlinear optical responses of purely excitonic, purely plasmonic and hybrid excitonic-plasmonic transitions. The transient behavior of the absorption changes at the hybrid transition frequencies gives further insight into coupling mechanisms between excitons and plasmons.