Terahertz metamaterials with VO2 cut-wires for thermal tunability

Abstract

An active terahertz (THz) metamaterial with vanadium dioxide $\left({\text{VO}}_2\right)$ cut-wire resonators fabricated on glass substrate was proposed, and THz time-domain spectroscopy was used to probe the temperature-tuned electromagnetic properties. By thermal-triggering the insulator-metal phase transition of ${\text{VO}}_2$ , THz transmission signals through the metamaterial exhibit a significant decline with amplitude over 65%. Numerical simulations confirm the observations are due to the metallization of the ${\text{VO}}_2$ film with increasing temperature.