Dresden 2014 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 86: Photonic crystals and cavities
HL 86.7: Vortrag
Donnerstag, 3. April 2014, 11:00–11:15, POT 051
Influence of the number of ZnSe QWs on the light-matter interaction in microcavities — •SK. Shaid-Ur Rahman1, Merle Cornelius1, Thorsten Klein2, Carsten Kruse2, Detlef Hommel2, Jürgen Gutowski1, and Kathrin Sebald1 — 1Semiconductor Optics, Institute of Solid State Physics, University of Bremen, P.O. Box 330440, 28334 Bremen, Germany — 2Semiconductor Epitaxy, Institute of Solid State Physics, University of Bremen, P.O. Box 330440, 28334 Bremen, Germany
The strong light-matter coupling in semiconductor microcavities (MCs) exhibits a high potential to realize novel types of optoelectronic devices such as thresholdless lasers based on polariton lasing. In order to operate such devices at elevated temperatures, high oscillator and high coupling strengths are required. For this purpose II-VI semiconductors with large excitonic binding energies are advantageous. The coupling strength can be enhanced by increasing the number of quantum wells (QWs) and by optimizing the amplitude of the cavity field at the QW position. We investigate binary ZnSe QW-based microcavities with different numbers of QWs and cavity thicknesses. The samples are characterized by micro-reflectivity and micro-photoluminescence measurements at different temperatures. The distributed Bragg reflector (DBR) stopband is centered at about 2.78eV. The QW emission can be tuned into resonance with the cavity mode by changing the sample temperature. Measurements show, that both are in resonance at about 200K. By increasing the number of QWs, a tendency to reach the strong coupling regime can be observed.