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Simulated spectra of absorption in the underlying absorptive layer with different widths of (a) graphene ribbons; and (b) Fermi energies for TM mode.The enhancement factor of absorption in the absorptive layer is compared to that in an impedance matched medium. The absorption for TE (y-polarized) mode is also shown (the flat line), which almost keeps constant with the variation of the width and Fermi energy of graphene.
