Regensburg 2010 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 25: Focussed Session: Strong Light Matter Coupling II

HL 25.2: Vortrag

Dienstag, 23. März 2010, 14:30–14:45, H13

Characterization of the strong coupling in ZnSe-based monolithic microcavities — •K. Sebald^1,2, A. Trichet¹, M. Richard¹, Le Si Dang¹, and C. Kruse² — ¹CEA-CNRS-UJF group Nanophysique et Semiconducteurs, Institut Néel, 25 Avenue des Martyrs, F38042 Grenoble, France — ²Institute of Solid State Physics, University of Bremen, P.O. Box 330 440, D-28334 Bremen, Germany

II-VI-based microcavities are particularly well suited for the investigation of the photon-exciton coupling behavior in semiconductors under high excitation thanks to the much stronger exciton-photon coupling and the larger exciton binding energy as compared to other compounds. In this contribution we will present results on the optical properties of monolithic microcavities containing 20 ZnSe quantum wells located at the antinode positions of a 5λ cavity surrounded by distributed Bragg reflectors grown by molecular beam epitaxy. To achieve spectral tuning the sample has been grown without rotation resulting in a thickness gradient along the wafer. The strong coupling regime between cavity photon modes and quantum well excitons is challenging to be measured in this system, because the Rabi splitting is larger than the exciton binding energy. Hence, the strong coupling was characterized by measuring the lower polariton dispersion for different exciton photon detuning and temperatures. Furthermore, the influence of a lateral optical confinement on the polariton dispersion will be discussed for airpost pillar microcavities with diameters between 1.5 and 2 µm.