Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 68: Metal-Semiconductor Hybrids
HL 68.2: Vortrag
Donnerstag, 10. März 2016, 10:00–10:15, H10
Coherent coupling between excitons and surface plasmon polaritons reduces inhomogeneous broadening in a J-aggregate thin film at room temperature — Xuan Trung Nguyen1,2, •Antonietta De Sio1,2, Julia Witt2,3, Gunther Wittstock2,3, and Christoph Lienau1,2 — 1Institut für Physik, Carl von Ossietzky Universität Oldenburg, Germany — 2Center of Interface Science, Carl von Ossietzky Universität Oldenburg, Germany — 3Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Germany
Organic molecular aggregates are of particular interest for the development of novel nanostructures for technological applications spanning from artificial light harvesting to all-optical plasmonic switching. The optical spectra of these molecular aggregates are often dominated by structural disorder effects resulting in inhomogeneously broadened absorptive lineshapes at room temperature. By using broadband spectral interferometry we show that inhomogeneous broadening in a model J-aggregate cyanine dye is significantly reduced in the presence of an ultrathin sub-10-nm gold layer and the resulting optical spectra show almost perfect Lorentzian line shapes at room temperature. This surprising result is accompanied with the reduction of electron-phonon interactions (vibronic resonances) and increased delocalization of the wavefunction due to strong electronic coupling to surface plasmon polaritons.