URL: http://www.iap.uni-jena.de/Ultrafast+Optics/Research+Group+Diamant__+Carbonoptics/Topics/Topological+Photonics.print

Generated:

The most common degrees of freedom used for the description of a photonic system are frequency, wave vector, polarization and phase of the propagating light wave. However, in the last few years a new degree of freedom entered photonics: Topology - a property of photonic materials that relates to the global structure of their frequency dispersions - has been emerging as another indispensable ingredient, opening a path forward to the discovery of fundamentally new states of light and possibly revolutionary applications, including photonic circuitry less dependent on isolators and slow light insensitive to disorder. Based on *laser-written photonic waveguide lattices* [**J. Phys. B 43, 163001 (2010)**], we investiage the impact of topological quantities on the evolution of light. Recent results include the first demonstration of *topological insulation of light* [**Nature 496, 196 (2013)**], *supersymmetric mode conversion* [**Nature Commun. 5, 3698 (2014)**], the demonstration of the *topological creation and destruction of edge modes* [**Phys. Rev. Lett. 111, 103901 (2013)**], *in-band localized modes* [**Phys. Rev. Lett. 114, 245503 (2015)**], and the first demonstration of *novel edge states in the graphene geometry* [**Nature Mater. 13, 57 (2014)**]. Importantly, we expand our work also to the *non-hermitian regime* [**Phys. Rev. Lett. 113, 123903 (2014)**], where we showed how to *extract topological quantities from the evolution of a wave packet* [**Phys. Rev. Lett. (in press)**] .

Left: Waveguide structure for breaking time-reversal symmetry, which is required for the observation of topological protection of light [Nature 496, 196 (2013)]. Right: ArtistÂ´s impression of the light evolution in a non-hermitian waveguide lattice [Phys. Rev. Lett. 113, 123903 (2014)]. |