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Abstract
Thermally tunable extraordinary terahertz transmission in a hybrid metal–vanadium dioxide (${{\rm{VO}}_2}$) metasurface is numerically demonstrated. The metasurface consists of a metal sheet perforated by square loops, while the loops are connected with strips of ${{\rm{VO}}_2}$. The frequency and amplitude of the transmission resonance are modulated by controlling the conductivity of ${{\rm{VO}}_2}$. 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 ${{\rm{VO}}_2}$. 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 ${{\rm{VO}}_2}$, 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.
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