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(a)–(e) show the gradual adjustment process for perfect absorption. Fermi energy of each layer of graphene (from bottom to top) are set as (a) [1] eV, (b) [1, 1, 1, 0.8, 1, 1, 1, 1, 1] eV, (c) [1, 1, 1, 0.8, 1, 1, 1, 0.9, 0.8] eV, (d) [1, 1, 1, 0.8, 0.8, 1, 1, 0.9, 0.8] eV, and (e) [0.9, 0.9, 1.1, 0.8, 0.8, 1.1, 1.1, 0.9, 0.8] eV
