Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 29: Quantum Optics and Photonics I

Q 29.4: Vortrag

Dienstag, 6. März 2018, 14:45–15:00, K 0.016

Superlattices by twisted bilayer photonic graphene in photorefractive media — •Matthias Rüschenbaum, Marius Rimmler, Alessandro Zannotti, and Cornelia Denz — Institut für Angewandte Physik and Center for Nonlinear Science (CeNoS), Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany

Photonic graphene, characterized by a hexagonal, periodic refractive index modulation, features outstanding light propagation, band structures, and topological effects. From solid state physics it is well-known that two rotationally mismatched graphene monolayers introduce an additional large scale periodicity and thus create graphene superlattices. Such a material leads to the appearance of new physical phenomena that manifests predominantly in its band structure. Especially, the new superlattice potential leads to the formation of Dirac points that are slightly displaced from the Fermi energy. Despite these attractive features, a photonic realization of superlattice graphene is still lacking.

In our contribution, we propose the realization of twisted bilayer photonic graphene superlattices by photo-induced refractive index changes. Our approach is based on reversible two-dimensional photonic lattices created by optical induction, using complex non-diffracting writing beams. The resulting lattices show a transversely modulated refractive index while being invariant in the direction of propagation. Incoherent superposition of two of this lattices enables the realization of superlattice structures providing a platform to optically investigate quantum mechanical and topological effects caused by twisted bilayer graphene.