Prof. Dr. Christine Silberhorn and her team (University of Paderborn) recently demonstrated the first device that combines frequency conversion with high efficiency and bandwidth compression of single photons. The device, which is based on non-linear waveguides in Lithium Niobate manufactured in the group in Paderborn, allows to adapt photons from sources in the telecom range to atomic systems in the visible and near-infrared spectrum, paving the…
On November 30th 2016, Professor Shuji Nakamura, laureate of the Nobel prize for Physics in 2014, is giving a special lecture at the University of Paderborn.
Celebrating the 10th anniversary of the CeOPP, the TRR 142 and the GRK 1464 managed to invite Professor Nakamura as special guest for this event.
The 1st international workshop jointly organized by the CRC/TRR 142 and CRC/TRR 160 aimed at the researchers of the two coordinated programs to discuss the state of the art of quantum optics and quantum dot physics in five tutorials given by highly recommended speakers in the field.
For the first time the runners of the team "Nichtlinear"of the TRR 142 take part in the relay over the distance of 4 x 2.5 km at the Campuslauf 2016 on June 22th at the University of Paderborn. The team peformed by Prof. Dr. Dirk Reuter, Jun.-Prof. Dr. Tim Bartley, M.Sc. Michael Friedrich and Dr. Bettina Krüger finished the relay in the excellent time of 42.28 minutes.
Since a couple of years the importance of rules of good scientific practice is discussed in all scientific communities.
Recently, the “Konferenz der Fachbereiche Physik” (KFP) presented recommendations for good scientific practice during the academic qualification process.
For a circularly polarized pumping laser passing through the nonlinear optical crystal along its rotation axis, second harmonic generation with opposite spin state has a frequency shifts of ±3Ω. Download (105 KB)
30.03.2016
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TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen
The experimental physicist Prof. Thomas Zentgraf and his two colleagues from the University of Birmingham, Dr. Guixin Li and Prof. Shuang Zhang, proved for the first time experimentally the nonlinear rotational Doppler effect of light - nearly 50 years after its theoretical prediction by the Dutch Nobel Laureate Nicolaas Bloembergen.
On November 26/27th 2015 PhDs and postdocs from the TRR142 organized a workshop that addressed exclusively topics and methods of their interests. The workshop took place at the Hotel Esplanade in Dortmund.
More than 80 participants visited the German-MBE-Workshop 2015 in Paderborn on September 21/22th to discuss the latest developments in Molecular Beam Epitaxy (MBE).
Picture (Department of Physics): Controlling light with light. Schematic overview of the novel concept for single photon emission analyzed. The scheme is based on the two-photon emission of the doubly excited state (biexciton) of the semiconductor quantum dot. The emission of one photon is stimulated in a controlled manner. Then, the properties of the second photon (the single photon of interest) are determined and can be tailored as needed.
05.10.2015
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TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen
Within the scope of the Collaborative Research Center TRR 142 “Tailored Nonlinear Photonics”, the research groups of Prof. Dr. Stefan Schumacher and Prof. Dr. Artur Zrenner (both of the Department of Physics, University of Paderborn) developed a novel semiconductor based source of single light particles (or photons) with tailored properties. In the proposed scheme, the properties of the single photon can be flexibly and all-optically controlled.
Initiation of a new journalclub at the CRC/TRR 142
PhD students of the TRR142 recently initiated a new journal club (organized by PhDs for PhDs).
They meet regularly during terms to discuss up-to-date papers of their field of interest.
The papers will be presented by one of the PhDs and discussed by the participants in a relaxed atmosphere and in the absence of their supervisors.
The aim of this journal club is, on the one hand, to broaden…
When natural occurring nonlinear material is excited by strong laser light the different propagation velocities of light for the different wavelengths result due to destructive interference in a weak signal. In the novel tailored nonlinear material the second harmonic generation is induced in specific structures at nanoscopic scale with a well-defined phase. To obtain such additional phase by each artificial atom the concept of spin rotation coupling of light is used to control the phase of the structure of the material which finally results in a constructive interference and an enhancement of the signal.
13.04.2015
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TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen
Prof. Dr. Thomas Zentgraf and his team (University of Paderborn) has developed in collaboration with researchers from the University of Birmingham a new method to tailor the nonlinear optical properties of artificially structured material. With their new approach completely novel properties of materials can be obtained which cannot be implemented by naturally occurring materials.
Physicists from the TRR 142 and CeOPP organize this year the German MBE-workshop.
The meeting takes place on September 21st/22nd 2015 at the University of Paderborn.
The aim of this meeting will be exchanging scientific knowledge and experience as well as addressing technical problems and challenges with respect to molecular beam epitaxy. Thus, the scientific program and the industrial exhibition will complement one another.
The UNESCO has declared the year 2015 as the “International Year of Light 2015”. Several international events are coordinated by the UNESCO and their partners as well as the European Physical Society. In Germany several activities are coordinated by the German Society of Physics (DPG).
Investigating in the many aspects of the science of light is the main focus of the Physicists of the TRR 142.
Delivering insight to the public the group of…
