Polarization-sensitive tunable extraordinary terahertz transmission based on a hybrid metal–vanadium dioxide metasurface

Thermally tunable extraordinary terahertz transmission in a hybrid metal–vanadium dioxide ( V O 2 ) metasurface is numerically demonstrated. The metasurface consists of a metal sheet perforated by square loops, while the loops are connected with strips of V O 2 . The frequency and amplitude of the transmission resonance are modulated by controlling the conductivity of V O 2 . For a y -polarized incident field, the resonance transmission peak redshifts from 0.88 to 0.81 THz upon insulator-to-metallic phase transition of V O 2 . For an x -polarized incident field, the transmission resonance at 0.81 THz is observed in the insulator phase. However, in the metallic phase of V O 2 , the electromagnetic field is effectively reflected in the 0.5–1.1 THz range with a transmission level lower than 0.14. The proposed metasurface can be utilized as a terahertz modulator, reconfigurable filter, or switch.