News

At this year's NOEKS conference in Dortmund we had the chance to meet Prof. Mark Fox from Sheffield University. Lot of students might know Professor Fox based on his famous books "Quantum Optics" and "Optical Properties of Solids".

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Our master student Daniel Frese will start a five month internship at the University of Birmingham (UK). In collaboration with Prof. Shuang Zhang's group new Metamaterials for manipulation of light propagation will be explored. The internship is supported by the ERASMUS+ program of the EU.

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We welcome Christian Schlickriede and Fabian Meyer as new group members.

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Nonlinear optical processes on nanostructured surfaces allow higher storage density and background free holographic image generation.

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Our recent work about the rotational Doppler-effect in nonlinear optics was highlighted by Nature Photonics in its June issue.

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Participation of our group at the 2nd International POSTECH Nanophotonics Workshop at the POSTECH in Pohang, South Korea.

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Dr. Guixin Li (left) and Prof. Thomas Zentgraf (right) in the Laser laboratory at the University of Paderborn.

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.

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Our master student Bernhard Reineke visits for a two weeks period the POSTECH in Pohang (South Korea) to learn more about modern nanotechnology fabrication methods for Metamaterials. The collaboration with the group of Prof. Junsuk Rho at the Deartment for Mechanical Engineering is financially supported by the Federal Ministry of Education and Research (BMBF).

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Prof. Atsushi Ishikawa from the Okayama University in Japan is visiting our group in Paderborn.

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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.

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Seminar for Bachelor students at the Department of Physics at Kasetsart University about recent research topics in physics.

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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.

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First visit at the Rice Research Center in Pathumthani near Bangkok. Agricultural scientist Kunya Cheaupun explains the research problems for rice farming.

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The IOP based website nanotechweb.org features a news article about our recent work of nonlinear metasurfaces.

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Prof. Thomas Zentgraf and B.Sc. Bernhard Reineke presenting the newly developed nonlinear materials.

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.

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