Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 20: Nano-optics of metallic and semiconducting nanostructures (time resolved)
O 20.10: Vortrag
Dienstag, 24. März 2009, 12:45–13:00, SCH A216
Coherent exciton-surface plasmon polariton coupling in hybrid metal-J-aggregate — •Robert Pomraenke1, Parinda Vasa1, Stephan Schwieger2, Erich Runge2, and Christoph Lienau1 — 1Carl von Ossietzky Universitaet, Institut fuer Physik, 26111 Oldenburg, Germany — 2Technische Universitaet Ilmenau, Institut fuer Physik, 98684 Ilmenau, Germany.
Understanding and manipulating the interactions between quantum emitters and Surface Plasmon Polaritons (SPPs) is the key to designing and implementing novel nano-optical devices such as nano-lasers or ultrafast optical switches. Here, we report the observation of a greatly enhanced coherent coupling between Surface Plasmon Polaritons (SPPs) excited on a metal grating and excitons in a J-aggregated cyanine dye. The hybrid metal-semiconductor nanostructure is fabricated by spin coating the dye solution on a gold grating fabricated using a focused ion beam. The structure is designed to maximize the radiative interaction between the two excitations which is probed by low-temperature, angle-resolved, far-field reflectivity and photoluminescence measurements. As a result of the strong interaction between the two resonances, coupled SPP-exciton polariton modes following hybrid dispersion relations are formed. The experimental results are explained within a phenomenological, coupled oscillator model. Such a strong interaction can be used to significantly alter the optical response of an organic semiconductor or to design novel hybrid devices.