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We present the experimental observation of type-II optical Weyl points and corresponding Fermi arcs in a three-dimensional photonic structure. We employ a system composed of an array of staggered helical waveguides fabricated using the direct laser writing technique. Weyl points are established by observing conical diffraction and Fermi arcs are demonstrated by showing surface confinement (and deconfinement)...
We show that topological insulator crystals are an excellent plasmonic platform in the UV to near-IR part of the spectrum, thanks to the interplay of interband transitions and Drude-like response of metallic surface states. This opens up exciting opportunities for the integration of plasmonic, electronic and spintronic devices.
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