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HL: Fachverband Halbleiterphysik

HL 44: Optical Properties I

HL 44.3: Talk

Wednesday, March 9, 2016, 10:15–10:30, H10

Strong coupling in a resonant inorganic/organic microcavity — •Michael Höfner¹, Sergey Sadofev¹, Björn Kobin², Stefan Hecht², and Oliver Benson¹ — ¹Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin — ²Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin

We present strong exciton photon coupling in a hybrid microcavity containing ZnO/ZnMgO quantum wells and specially synthesized ladder-type oligo-(p-phenylene) molecules. An epitaxially grown ZnMgO based Bragg reflector followed by six ZnO quantum wells and the active molecule embedded in a polymer matrix. The cavity is completed by evaporating a SiO₂/ZrO₂ based dielectric mirror. The system is investigated by low temperature angular resolved reflectivity revealing a clear anticrossing related to the Frenkel and Wannier-Mott exciton creating three polariton branches. At an angle of incidence of 35^∘ an equal mixing of all resonances is reached [1]. Through careful adjustment of the oscillator strength of both active materials and the cavity design, we reach an equal mixing in the middle polariton branch. A hybrid exciton-polariton with equal contribution of the photon, Frenkel and Wannier-Mott resonance is created. This makes this new material combination an excellent candidate for tailoring the phonon assisted polariton relaxation and creating a polariton laser.

[1] M. Höfner, S. Sadofev, B. Kobin, S. Hecht and F. Henneberger, Hybrid polaritons in a Resonant Inorganic/Organic Semiconductor microcavity, Appl. Phys. Lett. 107, 181109, 2015.