Thermally controlled terahertz metamaterial modulator based on phase transition of VO2 thin film

Utilizing insulator-metal phase transition of vanadium dioxide thin film, we propose a thermally controlled terahertz modulator based on metamaterial, and research the transmission characteristics and temperature tunable characteristics of phase transition in metamaterials in THz wave band. While the incident THz wave is of horizontal polarization or vertical polarization, two independent pass bands are generated near 1 THz. The center frequencies of the two pass bands are 1.3 THz and 1.7 THz, the bandwidths of them are 0.2 THz and 0.35 THz. In addition, when temperature rises from 40 degrees C to 80 degrees C, the transmissions of the two pass bands drop apparently, especially at phase transition temperature of 68 degrees C. For the two polarization states, the modulation depths achieve 60% or more, which is the great function of a modulator.