Observation of tunable resonance mode by changing the conductivity in terahertz metamaterial

The study of terahertz band has been widely concerned, and the combination of metamaterials and various reconstruction mechanisms has made great progress in recent years. In this paper, we simulate the effect of splitting the gallium arsenide(GaAs) layer with different conductivity in the twisted split-ring resonator(SRR) pairs structure on the inductive coupling strength. We find that with the increase of the conductivity of the doped GaAs layer, the transmittance of the nonresonant region decreases, the resonance intensity decreases, and the frequency shows a blue-shift. When the conductivity increases to more than 64 S/m, the two resonant dips merge into one, and the inductive coupling gradually weakens until disappears. At the same time, we simulate the current and electric field diagram to confirm our results. Our findings are helpful to adjust the resonant intensity of metamaterials by optical pumping or DC bias in the following experiments, which improves the basic understanding of metamaterials and reconfiguration mechanisms.