Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 36: Organic Semiconductors (joined session with CPP, DS)

HL 36.9: Vortrag

Dienstag, 21. März 2017, 12:00–12:15, POT 251

Three-dimensional confinement and exciton-polaritons in open organic microcavities — •Simon Betzold1, Marco Dusel1, Jürgen Ohmer2, Utz Fischer2, Christof P. Dietrich1, and Sven Höfling1,31Technische Physik, Universität Würzburg — 2Institut für Biochemie, Universität Würzburg — 3SUPA, School of Physics and Astronomy, University of St Andrews

Frenkel excitons, characteristic of organic semiconductors, possess large binding energies making them stable at room temperature, rendering polariton experiments at ambient air conditions possible. Organic materials further exhibit very large oscillator strengths and thus strongly interact with a cavity field. Since organic materials are very sensitive to the deposition of semiconductor layers on top of them, we use an open cavity system, which makes non-invasive investigation possible. Open cavities are tunable systems and comprise a bottom semiconductor distributed Bragg reflector (DBR) with the active material (the organic semiconductor) on top and a concave top DBR separated by a micrometer sized air gap. This configuration allows a 3D photonic confinement and brings unprecedently high quality factors into reach.Here, we show the versatility of open cavities by performing reflectivity and photoluminescence measurements in Fourier imaging configuration and exemplary investigate the strong exciton-photon coupling between a fluorescent protein and the dielectric cavity. We emphasize that the open cavity approach can easily be extended to more complex systems like photonic lattices and active regions including 2D monolayer materials or hybrid organic-inorganic bilayers.

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