News

Together with the group of Prof. Philip Russel (Max Planck Institute for the Science of Light), we have demonstrated the generation of ultrashort 4.4 fs laser pulses. These short laser pulses originate from a supercontinuum generated in a gas-filled hollow-core photonic crystal fiber. We will use th...

Diamond is a highly interesting material for electron sources because it is not only mechanically robust, chemically inert and thermally conductive, but also exhibits negative electron affinity if the surface is saturated with hydrogen. Due to this special property, diamond has a low work function a...

Peyman Yousefi has successfully defended his PhD dissertation -- congratulations, Dr. Yousefi!

Our former doctoral student and postdoc Dr. Michael Krüger received one of the coveted research grants of the European Research Council (ERC) and was recently appointed assistant professor at the Technion in Haifa, the Technical University of Israel - two outstanding successes. With the 1.69 mill...

In our latest publication, we demonstrate that we can divide an electron beam with much higher energy than previously possible into two beams by using a double-layer microwave structure. The working principle of this electron beam splitter is based on the fact that the movement of charged particles ...

The workshop on Saturday, June 29, is dedicated to the current research field of ultrafast physics on the femtosecond to attosecond scale. The participants will be guided from the physical basics to established techniques and current research. This will provide an insight into this exciting and prom...

During the weekly physics colloquium on Wednesday, January 9, 2019, we invited Karsten Schwanke to talk about climate change and its effects on the weather. Karsten Schwanke studied meteorology and wrote his diploma thesis with the well-known climate researcher Hartmut Graßl in Hamburg. The announce...

Recently, the coherent manipulation and control of electron trajectories in condensed matter systems with the aid of tailored electric fields has attracted particular attention. Studying this coherent response of electrons using controlled optical waveforms allows for investigating electric properti...

In our recent publication in Optics Letters, we show how a dielectric laser accelerator (DLA) can be more efficient. Our silicon dual-pillar structures equipped with a distributed Bragg reflector (DBR) can accelerate electrons 57% more than their counterparts without a DBR. This improvement in accel...

A nice article on ACHIP has been published in the DESY research magazine. Issue 1/2019 is dedicated to the plasma acceleration of charged particles. Since the dielectric laser acceleration is related, our scientific progress towards a particle accelerator on a chip is also shown there, see p. 29 her...

Our former bachelor student Helene Müller and our former master student Jonas Heimerl were honoured with an Ohm Prize for their final theses at the graduation ceremony of the Department of Physics. This award for the best theses of the past year is presented "for the promotion of young scientists in...

The local electrostatic field at sharp field emission tips is key to answer fundamental questions of how the field interacts with these tips. Despite a long history of study, three-dimensional (3D) electrostatic fields at nanometer resolution around sharp tips have not been experimentally quantified...