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aPhase components and retardation of an all-dielectric/graphene metasurface and b the corresponding transmission coefficients Txx and Tyy. Phase retardation plotted as a function of wavelength for L1 = 440 nm, L2 = 370 nm, and W = 60 nm, for c varying Fermi energy and d varying L2 from 350 to 450 nm
