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Individual steps (a)–(d) of the conformal map used to generate a grating from a translationally invariant slab. The thickness of a metallic grating is equivalent to the conductivity profile of a inhomogeneously doped graphene sheet (e). The setup consists of a p-polarised wave, normally incident on a graphene sheet, whose chemical potential μ, and hence its conductivity σ is periodically modulated.
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