When light hits a pinhole with a hole diameter below the wavelength as a plane wave, spherical waves can form behind the pinhole. If now a whole ensemble of holes with well-considered positioning is chosen, the different spherical waves can interfere with each other in any way. The superposition of the transmitted individual waves then results in a new wave front which can, for example, carry image information. Such a construct is called a photon…
Who doesn't know the laser sword from the Star Wars movies? But what are lasers and how do they work? What else can you do with them? These were the questions the students of the MINT-EC-Camp: Laser Physics explored during their visit to the Department of Physics.
Congratulations to Dr. Christian Schlickriede. After a successful disputation of his thesis on Nonlinear Metalenses, Mr. Schlickriede will leave us. We wish him every success in his further life and career.
In our recent publication entitled ‘Nonlinear Bicolor Holography Using Plasmonic Metasurfaces’ published in ACS Photonics, we show that two types of nanoparticle scatterers combined in one geometric metasurface can form a nonlinear colored hologram.
In a joint project between the group of Professor Thomas Zentgraf at the University of Paderborn and Professor Junsuk Rho at the Pohang University of Science and Technology in Korea, both groups plan to develop so-called multifunctional metasurfaces.
During a visit with our project partner Prof. Huang at the Beijing Institute of Technology in Beijing (China) we discussed the properties of nonlinear metasurfaces during a seminar. The exchange is financially supported by the DFG and the NSFC.
Every year the Scientific American publishes the “The Top 10 Emerging Technologies” of the year. This year the, the research on metalenses is among these emerging technologies. For several years, our group is studying these new kinds of lenses that have only the thickness of a fraction of a human hair and several interesting properties.