Fig. 6: Comparison of the performance of the variable resistance and tunable capacitance modulators. | Light: Science & Applications

Fig. 6: Comparison of the performance of the variable resistance and tunable capacitance modulators.

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

Fig. 6

Reflectance and modulation depth of the variable resistance modulator (without air gap: a–c) and tuneable capacitance modulator (with air gap, rair = 0.23: d–f). The device structure has the parameters \(g\) = 1.5 μm, \(c\) = 3 μm, \({d}_{{\rm{x}}}\) = 45.5 μm, \({d}_{{\rm{y}}}\) = 45.5 μm. a, d TDS measurements of the reflectance of the brickwork antenna metamaterial as a function of frequency with gate voltage varied. b, e COMSOL simulation of the frequency-dependent reflectance of the brickwork antenna metamaterial for different conductivities. c, f Measured frequency dependence of the modulation depth

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