Dual-band tunable infrared metamaterial absorber with VO2 conformal resonators

A dual-band tunable infrared metamaterial absorber with VO₂ is proposed. This tunable metamaterial absorber is constructed of three individual layers of conformal resonating layer, dielectric layer, and metallic background. The resonator is composed of gold and VO₂. The electromagnetic (EM) wave absorption is numerically calculated and the working mechanism is explained by the surface current and LC-circuit model. Due to the fact that the resonator frequency depends on the resonating gold structure, it is found that by partially replacing the gold structure with VO₂, the absorption frequency and intensity can be tuned through changing the temperature of VO₂ resonate structure. In addition, the proposed method can be applicable to other resonate shapes.