Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 44: Poster Session I
HL 44.89: Poster
Dienstag, 15. März 2011, 18:00–21:00, P3
Combinatorial growth of ZnO resonators — •Helena Hilmer1, Tom Michalsky1, Chris Sturm1, Rüdiger Schmidt-Grund1, Jesús Zúñiga-Pérez2, Renate Fechner3, Frank Frost3, and Marius Grundmann1 — 1Universität Leipzig, Inst. für Exp. Physik II, Linnéstr. 5, 04103 Leipzig — 2CRHEA, Rue Bernard Grégory, 06560 Valbonne, France — 3IOM e.V., Permoserstr. 15, 04318 Leipzig
We report on the growth of planar microresonators, which consist of two all-oxide Bragg reflectors surrounding either a MgZnO/ZnO quantum well (QW) structure or a ZnO bulk cavity as active medium. For the growth of such resonators, there is a competition between a high-quality photonic structure and a homogeneous electronic system. In order to improve both simultaneously we use a combination of different preparation techniques as pulsed laser deposition (PLD), molecular beam epitaxy (MBE) and ion beam smoothing (IBS).
ZnO bulk cavities, grown intentionally rough, yield good electronic properties. By applying IBS on these structures we have improved the photonic properties. Clearly, two polariton branches can be seen, which are related to the A-/B- (coupling strength VA,B ≅ 15 meV) and the C-exciton (VC ≅ 60 meV) at T = 10 K, indicating both, high photonic and electronic quality.
For the QW-cavity, we have found an influence of the resonator on the QW-exciton lifetime, i.e. resonator is in the weak coupling regime. For the enhancement of the oscillator strength, multiple QW-cavities have been grown by a combination of PLD and MBE showing smooth layers together with good electronic properties.