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Optical response of the graphene plasmonic metasurface (period 2.5 μm, permittivities of surrounding media ε 1 = 2.25, ε 2 = 1). (a) Reflectance (upper panel) and absorbance (lower panel) as a function of frequency and strength of the conductivity modulation. (b) Reflectance, absorbance and transmittance spectra (upper panels), as well as relative phase of reflected and transmitted fields (lower panels), for two different values of the modulation strength (w 0 = 1, left, and w 0 = 3, right). For w 0 = 1, a 0 and a 1 in equation (1) take the values 1.1048 and 0.4696, respectively, and for w 0 = 1, a 0 = 2.6237 and a 1 = 2.4225. The lines show the analytical results calculated with transformation optics, and the dots correspond to full electrodynamic simulations.
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