PD Dr. habil. Tobias A. F. König

Group Leader Plasmonic Functional Surfaces
at the Leibniz-Institut für Polymerforschung Dresden e.V.

Hohe Strasse 6
01069 Dresden

Phone: +49 (0)351 4658-676
Fax: +49 (0)351 4658-281
Email: koenig@ipfdd.de

Future developments in nanophotonics require facile, inexpensive, and parallelizable fabrication methods and need a fundamental understanding of the spectroscopic properties of such nanostructures.

Our mission statement/challenges can be met through the colloidal self-assembly approach, where pre-synthesized colloids are arranged over large areas at a reasonable cost. To realize fabrication on a larger scale, a synergy between optical surfaces and colloidal self-assembly will be leveraged. This requires, on the one hand, applying concepts from applied optics and, on the other hand, using pre-existing colloids such as photoluminescent emitter or plasmonic nanoparticles.

The research group focuses on the spontaneous organization of pre-existing colloids, which are organized based on particle interactions or pre-existing templates. Recently, the research group showed that these colloidal self-assembly concepts can be applied to both plasmonic particles and semiconductive nanocrystals. We have shown that photoluminescent gratings can be simply stacked to obtain circular dichroism without using elaborate chiral building blocks. Such lossless and tunable circular filters show a potential use for chiroptical sensors. Due to their strong chiral fields, the stacked plasmonic gratings show significantly better sensitivity in comparison to conventional sensors. Note, the chiral effect is not based on chiral building blocks, rather on the stacking of the colloidal nanostructures. 

• Volkswagen Foundation: Freigeist Fellowship - A One Way Road for Light
• DFG: Coherent Energy Transfer in a Self-Assembled Plasmonic Lattice (in collaboration with Prof. Lippitz, Uni Bayreuth)
• DFG: Plasmonic Organic Microcavity Laser (in collaboration with Prof. Leo, IAPP Dresden)

• Mayer, M.; Schnepf, M. J.; König, T. A.; Fery, A., Colloidal Self‐Assembly Concepts for Plasmonic Metasurfaces. Advanced Optical Materials 2019, 7 (1), 1800564.
• Goßler, F. R.; Steiner, A. M.; Stroyuk, O.; Raevskaya, A.; König, T. A., Active Plasmonic Colloid-to-Film-Coupled Cavities for Tailored Light–Matter Interactions. The Journal of Physical Chemistry C 2019, 123 (11), 6745-6752.
• Sarkar, S.; Gupta, V.; Tsuda, T.; Gour, J.; Singh, A.; Aftenieva, O.; Steiner, A. M.; Hoffmann, M.; Kumar, S.; Fery, A.; Joseph, J.; König, T. A. F., Plasmonic Charge Transfers in Large-Scale Metallic and Colloidal Photonic Crystal Slabs. Advanced Functional Materials 2021, 2011099.
• Aftenieva, O.; Schnepf, M.; Mehlhorn, B.; König, T. A. F., Tunable Circular Dichroism by Photoluminescent Moiré Gratings. Advanced Optical Materials 2021, 9 (4), 2001280.
• Probst, P. T.; Mayer, M.; Gupta, V.; Steiner, A. M.; Zhou, Z.; Auernhammer, G. K.; König, T. A. F.; Fery, A., Mechano-tunable chiral metasurfaces via colloidal assembly. Nature Materials 2021,
  DOI: 10.1038/s41563-021-00991-8.

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