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(a) The configuration of absorber based on the approach of tuning surface resistance (TSR) and its unit cell. (b) Measured and simulated absorption coefficients of the TSR absorber under the different surface impedance of graphene. (c) The configuration of absorber based on the approach of stacking graphene metasurface (SGM). (d) Measured and simulated absorption coefficients of the SGM absorber when stacking 1, 2 and 3 graphene films.
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