Abstract
Based on the insulator-to-metal phase transition of vanadium dioxide (VO 2), a terahertz (THz) tunable metasurface lens (TML), which consists of a THz metasurface lens and a VO 2 film on Al 2 O 3 substrate, is proposed and experimentally verified. The focal intensity of the TML can be thermally controlled. The changes of the cross-polarized amplitude spectrum and the focal intensity during the heating and cooling processes are also investigated in detail. Any desired focal intensity can be obtained by adjusting the TML temperature. This TML and its approach will be of great significance for the development of the THz active devices.
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