Abstract
In this work we discuss the modes supported by a planar metasurface comprised of two layers of circular metal patches that form two identical hexagonal arrays. The layers are stacked together but displaced with respect to each other and separated by a dielectric slab. In our study, each metasurface is infinitely periodic in one direction (x) but only a few periods wide in the orthogonal direction (y). By modelling and experiment, we find the existence of a localized edge mode that only appears for a certain relative displacement of the layers. This edge mode is later used to guide the propagation of electromagnetic energy around different shapes, including sharp corners.
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