2, Fraunhofer ITWM, Kaiserslautern, , Germany
Microstructuring of materials on the scale of the wavelength or below is a well established approach to realize new optical properties not present in the bulk material itself. In the first part, we report on direct laser written photonic topological insulators supporting a topologically protected edge mode. While transport along such an edge mode is known to be stable against static defects, we examine the influence of time-dependent defects on the transport properties . We find that in contrast to static defects time dependent defects are not excluded from transport, eventually leading to a splitting of the edge mode.
In the second part, we study the influence of intensity patterns on the magnetic properties of spin-wave guides made from Yttrium-Iron-Garnet (YIG) and find that such materials can easily be reconfigured, allowing for the formation of so called magnonic crystals  and for mode conversion between modes not adressable due to energy and momentum conservation. 
 "Dynamic defects in photonic Floquet topological insulators", C. Jörg, F. Letscher, M. Fleischhauer, and G. von Freymann, New J. Phys. 19, 083003 (2017)
 "Optically reconfigurable magnetic materials", M. Vogel et al., Nature Physics 11, 487 (2015)
 "Adiabatic Control of Spin-Wave Propagation using Magnetisation Gradients", M. Vogel et al., submitted (2017)