Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 62: Gallium Nitride: Optical and Electronic Properties
HL 62.3: Vortrag
Mittwoch, 9. März 2016, 15:15–15:30, H17
Optical properties of two dimensional photonic crystal membranes in cubic AlN — •Sarah Blumenthal1, Matthias Bürger1, Andre Hildebrandt2, Jens Förstner2, Nils Weber1, Cedrik Meier1, Dirk Reuter1, and Donat J. As1 — 1University of Paderborn, Department of Physics, Germany — 2University of Paderborn, Department of Theoretical Electrical Engineering, Germany
Group III-nitride quantum dots (QDs) attracted much attention for the development of optical and quantum optical devices, operating in the UV spectral range. Microresonators enable to control the spontaneous emission of light and to realize an efficient single photon emitter (SPE). Promising candidates for such devices are 2D photonic crystal (PhC) nanocavities. Recently, SPE employing hexagonal QDs in AlN have been realized. However h-GaN QDs exhibit a strong internal electrical field causing a reduced recombination probability of electrons and holes in confined states. This issue may be overcome by using cubic AlN/GaN. We implemented a process to fabricate freestanding c-AlN/GaN membranes with a 2D hexagonal array of holes. We have investigated the optical properties of the QD ensemble and different PhCs (including H1 and L3 cavities) using micro-photoluminescence measurements at room temperature. For both cavity types, fundamental modes with high quality factors were determined. To validate the experimental results, simulations, using the time domain solver from CST Microwave Studio, were done. The simulations fit very well to the experimental results.