Topological states have experienced ongoing fascination in condensed matter physics and the discovery of topological insulators [1] was one of the highlights of recent years. Using the so-called Floquet topological insulators (FTI) [2, 3] our team experimentally demonstrated a photonic topological insulator [4]. This is a 2D lattice of evanescently coupled waveguides that are arranged in a honeycomb (graphene-like) geometry, where each waveguide is twisted around its axis in a helical fashion.

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