MIOMD-XI Speakers    
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1.  Prof. Gunther Springholz, Johannes Kepler University Linz, AUSTRIA
Late-Breaking Results: Quantum Dot Microcavity Lasers based on Epitaxial PbTe Dots Embedded in CdTe with 3.7 μm CW Mode Emission
Speaker Biography: Gunther Springholz studied physics at the Technical University in Graz and the University of Linz in Austria, where he received his PhD in 1993. Since 1998, he is an associate professor at the Institute for Semiconductor Physics of the University of Linz, where he is leading a research group on IV-VI and SiGe semiconductors. He is author or co-author of more than 260 scientific papers, including several review articles and book chapters. His current research interests are semiconductor hetero- and nanostructures with a focus on narrow gap semiconductors, mid-infrared optoelectronic devices as well as magnetic semiconductors and topological insulators.

Summary: The first mid-infrared quantum dot lasers are demonstrated, fabricated from the PbTe/CdTe quantum dot system. The quantum dots are produced by a novel strain-free synthesis method, resulting in highly symmetric QDs without any 2D wetting layer on GaAs substrates. Due to the very large difference in band gaps, PbTe/CdTe QDs display strong MIR emission at room temperature and a wide wavelength tunability from λc= 1.4 to 4 µm by control of the dot size. Free-standing microdisk structures show cw mid-infrared laser emission between 4.7 to 3.7 µm wavelength up to 200 K, and pulsed mode emission up to room temperature.
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