Regensburg 2016 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 46: Organic Semiconductors

HL 46.1: Talk

Wednesday, March 9, 2016, 09:30–09:45, H13

Exciton-Polaritons in Open Organic Microcavities — •Simon Betzold, Christof P. Dietrich, and Sven Höfling — Technische Physik, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg

Frenkel excitons, characteristic of organic semiconductors, possess large binding energies and are stable at room temperature, making polariton experiments at ambient air conditions feasible. Organic materials further exhibit very large oscillator strengths and thus strongly interact with a cavity field. Circumventing the issue that organic materials are very sensitive to the depositing of semiconductor layers on top of them, we use an open cavity system, which makes non-invasive investigation of the active material 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 exemplarily investigate the strong exciton-photon coupling between a red-emitting polymer and the dielectric cavity. We emphasize that the open cavity approach can easily be extended to more complex active regions including two-dimensional monolayer materials or hybrid organic-inorganic bilayers.