Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 54: Organic semiconductors
HL 54.9: Talk
Friday, March 16, 2018, 11:45–12:00, EW 203
Fano resonance in hybrid nanostructures - result of exciton-surface plasmon polaritons coupling — •Xuan Trung Nguyen1, Antonietta De Sio1, James Lim2, Alexandra Markovic3, Julia Witt3, Moritz Gittinger1, Martin Silies1, Gunther Wittstock3, Susana Huelga2, Martin Plenio2, and Christoph Lienau1 — 1Institut für Physik, Universität Oldenburg, Germany — 2Institut für Theoretische Physik and IQST, Universität Ulm, Germany — 3Institut für Chemie, Universität Oldenburg, Germany
The coupling between excitons and surface plasmon polaritons in organic-metal hybrid nanostructures has been subject of many studies. Using broadband spectral interferometry, we observe that the linear optical spectrum of a J-aggregate cyanine dye transforms from a symmetric Lorentzian into an asymmetric Fano line shape in the presence of an ultrathin gold layer. Reconstruction of both amplitude and phase of the linear optical response function in the time domain allows us to determine the Fano asymmetry parameter q as a phase shift with respect to the Lorentzian response function. We show that, in the frequency domain, q results in a rotation of the optical response in the complex plane . We explain the formation of the Fano resonance as the result of coupling between the J-aggregate excitons and surface plasmon supported by the dielectric-metal interface and quantitatively extract the coupling strength. This introduces a new and straightforward technique for probing the interaction between plasmons and quantum emitters, also at the single nanoparticle level.