Fig. 1From: Design of a Tunable Ultra-Broadband Terahertz Absorber Based on Multiple Layers of Graphene Ribbonsa Schematic diagram of the graphene-based broadband absorber. b Cross section of the absorber with the parameters used for calculation. c The schematic of the external bias circuit. The branches of the voltage (V1~V9) are connected to diferent graphene layers, respectivelyBack to article page