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NM09.18.01 : Wavetransport in Optically Induced Materials

1:30 PM–2:00 PM Apr 6, 2018

PCC North, 200 Level, Room 231 BC

Description
Georg von Freymann1 2

1, TU Kaiserslautern, Kaiserslautern, , Germany
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 [1]. 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 [2] and for mode conversion between modes not adressable due to energy and momentum conservation. [3]

[1] "Dynamic defects in photonic Floquet topological insulators", C. Jörg, F. Letscher, M. Fleischhauer, and G. von Freymann, New J. Phys. 19, 083003 (2017)
[2] "Optically reconfigurable magnetic materials", M. Vogel et al., Nature Physics 11, 487 (2015)
[3] "Adiabatic Control of Spin-Wave Propagation using Magnetisation Gradients", M. Vogel et al., submitted (2017)

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