Picture (Physics Department): Schematic illustration of our experiment. The illumination of the nanostructures with right circular polarized light (+σ) of wavelength λ generates a second harmonic wave with λ/2. The rotation of the structures with respect to each other with an angle θ generates an additional phase. Hence, the structures send out the nonlinear light under an angle, the 1st diffraction order. Each structure generates hereby a left circular polarized wave –σ and a local phase ϕ = 3σθ, which is only determined by the rotation angle.
Metamaterials again? In the recent issue of the magazine "Physik in unserer Zeit" (only available in German) we report about the tailored properties of nanostructured materials for nonlinear optics.
Visit at the National Electronics and Computer Technology Center (NECTEC) in north Bangkok. The director of the Intelligent Devices and System Gruppe, Dr. Pongpan Chindaudom, explains the research activities.
First visit at the Rice Research Center in Pathumthani near Bangkok. Agricultural scientist Kunya Cheaupun explains the research problems for rice farming.
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.
We recently achieved a new record for the efficiency of our metasurface holograms which are made only from a single layer of nanostructured plasmonic materials. With our new technique we were able to increase the efficiency by nearly 800% compared to previous hologram structures.
Die Universitätsgesellschaft verlieh Franziska Zeuner im Rahmen des Neujahrsempfangs der Universität Paderborn am 18. Januar 2015 den Preis für herausragende Abschlussarbeiten des Jahres 2013/2014 in der Kategorie Ingenieur- und Naturwissenschaften für ihre Masterarbeit zur kohärenten Kontrolle von lokalisierten Oberflächenplasmonen.
Physikalische Grundlagenforschung mit neuartigem Meta-Material aus Nano-Gold-Antennen – Erstmals konnte die mesoskopische Symmetrieabhängigkeit nichtlinear-optischer Prozesse nachgewiesen werden.
Die Fachschaft des Departments Physik der Universität Paderborn zeichnete Prof. Dr. Thomas Zentgraf mit der „Goldenen Kreide“ für die beste Lehrveranstaltung in 2012/2013 aus. Der Preis wird jährlich von der Fachschaft Physik an den Dozenten vergeben, der in der Evaluation der Lehrveranstaltungen die besten Wertungen von den Studierenden erhält.
Our group is organizing the 551. Heraeus-Seminar on "Active Nanoplasmonics and Metamaterial Dynamics" together with Prof. Ortwin Hess from Imperial College London in the “Physikzentrum” of the German Physical Society in Bad Honnef.
Erstmals ist es gelungen 3D Abbildungen aus Nanostrukturierten Oberflächen zu erzeugen. Unsere Gruppe verwendete dazu ein besonderes Meta-Material mit nanoskopisch-kleinen Gold-Antennen, um die Information eines Objektes zu speichern.
