Valley photonic crystal (VPhC) is one of the photonic nanostructures that can host topologically protected edge states. The edge states enable efficient light guiding even under sharp corners. At a bearded interface consisting of two topologically distinct VPhCs, the edge state can be an in-gap slow light mode while keeping its robustness against sharp corners. The loss at sharp waveguide bends is largely suppressed for the topological slow light mode, compared to the non-topological slow light mode. Here, we discuss the design and the experimental demonstration of topological slow light waveguides in semiconductor VPhCs.
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