ECE Seminar - Quantum Dot Gain Material for Optoelectronic Devices Dedicated for High-Capacity Optical Links
2:00pm - 3:00pm
Classroom 2405 (via lifts 17/18)

After a brief overview about the group activities in nano science and technology, the impact of atom-like behavior of quantum dots (QDs) on the device physics will be discussed. The main focus of the talk will address InP based QD gain material and their applications in high-performance optoelectronic devices dedicated for high-capacity optical communication. Several device examples will be presented.

Record values were obtained in the temperature stability and the modulation speed of 1.55 µm QD lasers. Semiconductor optical amplifiers based on the same material exhibit high-bit rate operation up to 100 °C and cross-talk-free multiple wavelength amplification. Distributed feedback QD lasers show ultra-narrow linewidth emission of (30 +/- 10) kHz at 20 °C and 80 kHz at 80 °C, which is about 1.5 orders of magnitudes less than obtained with QW lasers.

Event Format
Speakers / Performers:
Johann Peter Reithmaier
Institute of Nanostructure Technologies & Analytics (INA) and Center of Interdisciplinary Nano Science and Technology (CINSaT) University of Kassel, Germany

Prof. Reithmaier studied physics at TU Munich and made his PhD at Siemens and Walter-Schottky-Institute in 1990. Until 1992, he worked as Postdoc at IBM in Rüschlikon, Switzerland on III/V epitaxy. In 1992, he joined University of Würzburg where he built-up a research group working on nanostructured semiconductors and their applications in optoelectronic devices. In 2005 he became a full professor of physics and director of the Institute of Nanostructure Technologies and Analytics at the University of Kassel.

He is author or co-author of more than 750 journal and conference papers (> 340 in refereed journals, 2 books, 10 book articles and > 140 invited talks, > 12,000 citations), He is a member of the Deutsche Physikalische Gesellschaft (DPG) and of IEEE Photonics Society. He became Fellow of IEEE in 2011. Since 2014, he is co-editor of OPTICA. He was and is on the advisory board of different national centers (EPSRC National Centre for III-V Technologies in UK 2010-2016, Centre of Nanophotonics for Terabit Communications (NATEC) in Denmark since 2016). Since 2016, he is speaker of the Center of Interdisciplinary Nanostructure Science and Technology (CINSaT) of University of Kassel. Since 2018, he is coordinator of the LOEWE priority project SMolBits (Scalable Molecular Quantum Bits).

His current interests are focused on nanostructured semiconductors and their optoelectronic applications. This includes self-assembly techniques of III-V quantum dot materials on GaAs, InP and Si substrates as well as nanostructuring by high-resolution lithographical techniques. New types of devices are investigated like nanolasers, single photon sources, ultra-high speed and narrow linewidth lasers, high power lasers, light emitting devices on silicon and nanocrystalline diamond for biomedical, quantum computing and quantum communication applications

Recommended For
Faculty and staff
PG students
Department of Electronic & Computer Engineering
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