Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 35: II-VI semiconductors III
HL 35.2: Vortrag
Mittwoch, 29. März 2006, 14:45–15:00, POT 151
Whispering gallery modes in ZnSe/MgZnSSe-microdiscs with CdSe quantum dots at room temperature — •Johannes Renner1, Lukas Worschech1, Silke Kuhn1, Suddho Mahapatra2, Karl Brunner2, and Alfred Forchel1 — 1Technische Physik, Universität Würzburg, Am Hubland, 97074 Würzburg — 2Experimentelle Physik III, Universität Würzburg
Several approaches are currently under investigation with the aim to control the coupling between photonic modes in a cavity with three dimensional optical confinement and excited states of quantum dots. We have studied by photoluminescence spectroscopy the emission from II-VI microdiscs with self assembled CdSe quantum dots. The quantum dots were embedded in the centre of a ZnSe/MgZnSSe heterostructure, which was grown by molecular beam epitaxy on top of a GaAs substrate. Electron beam lithography and etching techniques were applied to define microdiscs with diameters ranging from 0.5 to 5 µm. The samples were mounted on glass and the GaAs was removed. Quantum dot emission up to temperatures of 320K was detected. In addition to that we analyzed the dependence of whispering gallery modes on the disc size and for different temperatures. We were able to resolve whispering gallery modes with quality factors exceeding 1000 even at room temperature.