Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 3: Quantum dots: Microcavities and photonic crystals
HL 3.6: Vortrag
Montag, 25. Februar 2008, 12:30–12:45, ER 270
Hybrid microcavities with embedded CdHgTe quantum dots — •David Zingelmann1, Johannes Renner1, Lukas Worschech1, Andreas Löffler1, Matthias Schäfer2, Charles Becker2, Laurens Molenkamp2, and Alfred Forchel1 — 1Technische Physik, Universität Würzburg — 2Experimentelle Physik III, Universität Würzburg
We have realized a hybrid optical microcavity for the near infrared spectral range. The cavity is based on three different material systems. The central cavity layers are made of II-VI semiconductors, namely CdTe with embedded CdHgTe quantum dots as active material, formed by MBE growth and subsequent thermal annealing. The bottom mirror is implemented as high-quality III-V semiconductor distributed Bragg reflector (GaAs/AlAs), whereas the top mirror is built up by dielectric materials (SiO2/Si). From this structure micropillars with diameters of a few µm have been fabricated by reactive ion etching. By means of photoluminescence and reflectivity measurements we demonstrated 1- and 3-dimensional optical confinement in planar structures and micropillar cavities, respectively.