Hamburg 2001 – wissenschaftliches Programm
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SYOF: Organische Festkörper
SYOF 4: Optical Properties
SYOF 4.3: Vortrag
Dienstag, 27. März 2001, 15:40–15:55, S6
Observation of strong exciton-photon coupling in microcavities containing J-aggregates — •Peter Schouwink1, Hans v. Berlepsch2, Lars Dähne3, and Rainer F. Mahrt1 — 1Max-Planck Institut f. Polymerforschung, Ackermannweg 10, 55128 Mainz — 2Freie Universität Berlin, Institut f. Chemie - Physikalische und Theoretische Chemie, Takustr. 3, 14195 Berlin — 3Max-Planck Institut f. Grenzflächen- und Kolloidforschung, Am Mühlenberg 2, 14476 Golm/Potsdam
The modification and control of exciton and photon interaction is of both fundamental and technological interest. In a semiconductor microcavity two regimes of interaction can be distinguished: weak and strong coupling. While the spatial and spectral distributions are altered in the weak coupling regime, the latter one leads to a mixing of exciton and photon states and modifies strongly the dynamic behavior. J-aggregates are very suitable for observing the strong coupling regime within an organic semiconductor microcavity due to high oscillator strength combined with small linewidth of the optical transition. We used the dye 1,1’-diethyl-2,2’-cyanine borate (pseudoisocyanine)which can form so-called J-aggregates as optically active organic semiconductor in a planar microcavity. Stable thin layers of homogeneously distributed pseudoisocyanine aggregates without any matrix could be prepared by spin-coating of a specific dye salt. The anticrossing of exciton and photon modes demonstrates the strong exciton-photon-coupling. A Rabi-splitting of more than 50 meV was observed. Transmission and photoluminescence spectra will be discussed.