Terahertz Tunable Metasurface Lens Based on Vanadium Dioxide Phase Transition
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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.
KeywordsTunable metasurface lens Vanadium dioxide Terahertz
This work was supported by the 973 Program of China (No. 2013CBA01702), the National Natural Science Foundation of China (No. 61205097, 11374216, 91233202, 11204188, 11174211, and 11474206), the National High Technology Research and Development Program of China (No. 2012AA101608-6), the Beijing Natural Science Foundation (No. 1132011), the Program for New Century Excellent Talents in University (NCET-12-0607), the Program for Beijing Excellent Talents (No. 2013D005016000008), the CAEP THz Science and Technology Foundation, the Beijing youth top-notch talent training plan (CIT&TCD201504080) and the Scientific Research Base Development Program of the Beijing Municipal Commission of Education.
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