Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 71: Plasmonics and Nanooptics III

O 71.5: Vortrag

Donnerstag, 3. April 2014, 11:30–11:45, GER 38

Interplay between strong coupling and radiative damping of excitons and surface Plasmon polaritons in hybrid nanostructuresWei Wang1, Parinda Vasa1,2, Robert Pomraenke1, Ralf Vogelgesang1, Antonietta de Sio1, •Ephraim Sommer1, Margherita Maiuri3, Cristian Manzoni3, Giulio Cerullo3, and Christoph Lienau11Institut für Physik, Universität Oldenburg, 26129 Oldenburg — 2Indian Institute of Technolegy Bombay, 400076 Mumbai — 3Dipartmento di Fisica, Politecnico di Milano, Milano

Strongly coupled exciton - surface plasmon polariton systems (X-SPP) are of great interest, as they carry a high potential for realizing all-optical plasmonic circuits and devices [1]. For such applications it is imperative to tailor the radiative damping of the coupled system. So far, however, little is known about radiative damping of strongly coupled systems. We therefore study the optical response of a strongly coupled J-aggregate/SPP hybrid [1] by means of coherent angle-resolved spectral interferometry and ultrafast pump-probe spectroscopy. We find large differences between the radiative lifetimes of the hybrid upper (UP) and lower (LP) polariton mode. This indicates that two different energy transfer channels between X and SPP coexist: (i) coherent resonant dipole-dipole interaction [1] and (ii) an incoherent exchange due to spontaneous emission of a photon by one emitter and its subsequent reabsorption by another. The interplay between both pathways results in a pronounced modification of the radiative damping due to the formation of sub- and super-radiant polariton states.

1. Vasa, P. et al, Nature Photon. 7, 128-132, 2013

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