Sub-diffraction limited localization of fluorescent emitters is a major goal of microscopy imaging. It is of key importance for so-called super-resolution, a technique that was awarded the Nobel Prize in Chemistry in 2014. A cooperation of researchers in Australia, China, the USA and IRIS Adlershof have now demonstrated ultra-precise localization and tracking of fluorescent nanoparticles dispersed on a mirror. The approach is based on self-interference patters of the nanoparticles. These patterns can be picked up by a sensitive camera and subsequently compared to numerical simulations.
In this way, it was possible to localize individual particles with an accuracy of only 2.8 nm. Additionally, the localization can be performed rapidly, and a single particle can be followed with a 50Hz frame rate. This is much faster than other comparable methods. A special benefit of this new approach is its high photo-stability and sensitivity, e.g. to temperature and PH. Therefore, the novel technique may be used for high-resolution multimodality single-particle tracking and sensing.
Axial Localization and Tracking of Self-interference Nanoparticles by Lateral Point Spread Functions
Y. Liu, Z. Zhou, F. Wang, G. Kewes, S. Wen, S. Burger, M. Ebrahimi Wakiani, P. Xi, J. Yang, X. Yang, O. Benson, and D. Jin
Nat. Commun. 12 (2021) 2019, DOI: 10.1038/s41467-021-22283-0
IRIS Adlershof is delighted to announce that three leaders of Junior Research Groups, namely Dr. Stijn van Tongeren, Dr. Emanuel Malek, and Dr. Markus Krutzik will be joining IRIS Adlershof as junior members.
Dr. Stijn van Tongeren is leading an Emmy-Noether Independent Junior Research Group at the Physics Department of Humboldt-Universität zu Berlin since fall 2018. He is closely connected to the IRIS-research groups Mathematical Physics of Space, Time and Matter (Prof. Staudacher) and Quantum Field and String Theory (Prof. Plefka). Van Tongerens junior research group will receive more than one million Euros in funding over six years by the German Research Foundation. He and his group are working on integrable deformations of AdS/CFT and related holographic structures. This research is expected to uncover novel insights into the structure of quantum field theories and their dual string theories. Dr. van Tongeren received his PhD from Utrecht University in 2013. Between 2013 and 2018 he then worked as a Postdoctoral researcher in the group of Prof. Staudacher. Since 2020 he has also been a Principal Investigator at the RTG2575 “Rethinking Quantum Field Theory”.
Since August 2020 Dr. Emanuel Malek is leading an Emmy-Noether Independent Junior Research Group on “Exploring the landscape of string theory flux vacua using exceptional field theory” at the Physics Department of Humboldt-Universität zu Berlin, where he closely collaborates with the IRIS-groups of Prof. Plefka, Prof. Staudacher and Dr. Hohm. Maleks Junior research Group will receive more than 1.2 million euros in funding over 6 years from the German Research Foundation. After finishing his doctoral studies at the University of Cambridge in 2014, Malek spent one year as a Postdoctoral Fellow at the University of Cape Town, followed by a three-year-long stay as a Research Fellow at the Ludwig Maximilian University Munich. He subsequently worked at the Max-Planck-Institute for Gravitational Physics in Potsdam for two years.
Since 2019, Dr. Markus Krutzik is leading the „Joint Lab Integrated Quantum Sensors“ at the Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, where he has already been working as a guest researcher since 2017. Additionally, he has been a group leader at Humboldt-Universität zu Berlin since 2015, working on Quantum Sensors and Optical Technologies for Space Applications. His research focuses on the devlopment of the next generation of chip-scale quantum sensors for real world applications. Krutzik finished his doctoral studies at Humboldt-Universität zu Berlin in 2014. He then worked as a Postdoctoral researcher at the Cold Atom Laboratory of NASA’s Jet Propulsion Laboratory between 2014 and 2015, where he continued to work as a Technical Consultant between 2016 and 2018.
IRIS Adlershof congratulates its new members and is looking forward to a fruitful collaboration.
Erik Panzer, former junior researcher at IRIS Adlershof, who is now doing research at University of Oxford, has been awarded the 2020 Hermann Weyl Prize of the International Colloquium on Group Theoretical Methods in Physics for “his pioneering achievements in the calculation of amplitudes in gauge theories, for developing new mathematical structures that exploit the language of symmetries, and for his contribution to the description of important physical phenomena present in nature.” Panzer received his PhD in 2015 from Humboldt-Universität zu Berlin under the mentorship of IRIS Adlershof member Dirk Kreimer. Between 2015 and 2020, he then worked as a Post-Doctoral Research Fellow at the University of Oxford, where he then became a Royal Society Research Fellow in October 2020. His research interests include Feynman integrals, hyperlogarithms, (elliptic) polylogarithms, (elliptic) multiple zeta values, motivic periods, combinatorial Hopf algebras, renormalization, and Dyson–Schwinger equations. The Weyl Prize recognizes young scientists who have performed top-level original work in the area of understanding physics through symmetries.
Researchers in the HySPRINT joint lab Generative Manufacturing Processes for Hybrid Components (GenFab) of Humboldt-Universität zu Berlin (HU) and Helmholtz-Zentrum Berlin (HZB) have successfully implemented an ink produced by the Berlin-based company OrelTech in solution-processed organic light emitting diodes.
After inkjet printing the particle-free silver ink, an argon plasma is used to reduce the silver ions in the ink to metallic silver. “Because this process takes place at a low temperature, it is suitable for use with temperature-sensitive substrates, such as flexible plastic foils,” explains Dr. Konstantin Livanov, co-founder and CTO of OrelTech. The researchers fabricated organic light-emitting diodes employing the silver ink as a transparent conductive electrode on the flexible substrate PET. The resulting devices show comparable light output characteristics to those based on the otherwise widely used indium tin oxide (ITO). Crucially, however, the silver electrodes showed superior stability to ITO upon mechanical bending. Dr. Felix Hermerschmidt, senior researcher in the joint lab of HU and HZB, confirms, "The OLEDs based on the OrelTech ink remain intact at a bending radius at which the OLEDs based on ITO show breakage and fail.” This opens up several application opportunities of the printed devices. The work has been published in the journal Flexible and Printed Electronics and is available Open Access. GenFab, led by Prof. List-Kratochvil, who is a member of IRIS Adlershof,is moving into laboratories and offices in the new IRIS research building for further research and development work.
Publication: ITO-free OLEDs utilizing inkjet-printed and low temperature plasma-sintered Ag electrodes,
M. Hengge, K. Livanov, N. Zamoshchik, F. Hermerschmidt, and E..J. W. List-Kratochvil
Flex. Print. Electron. 6 (2021) 015009. DOI: 10.1088/2058-8585/abe604