Fig. 2: Equivalent circuit of the nanoscale capacitors and the brickwork antenna arrays. | Light: Science & Applications

Fig. 2: Equivalent circuit of the nanoscale capacitors and the brickwork antenna arrays.

From: Achieving 100% amplitude modulation depth in the terahertz range with graphene-based tuneable capacitance metamaterials

Fig. 2

a–c The capacitors of the structure are presented in a side view: a pure metallic gap of the antenna structure, b continuous graphene patch shunting the antenna gap (variable resistance, no air gap) and c nanoscale graphene patches protruding from either side of the metallic capacitor (tuneable capacitance, air gap). d Equivalent circuit model of a full metamaterial unit cell. The model of the capacitive gap is different, depending on whether the variable resistance or tuneable capacitance approach is used. The corresponding capacitor structures are shown in a top view

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