Switchable multifunctional terahertz metasurfaces employing vanadium dioxide

Xike Li, Shiwei Tang, Fei Ding*, Shuomin Zhong, Yuanqing Yang, Tao Jiang, Jun Zhou

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Abstrakt

In this paper, we design a type of switchable metasurfaces by employing vanadium dioxide (VO 2 ), which possess tunable and diversified functionalities in the terahertz (THz) frequencies. The properly designed homogeneous metasurface can be dynamically tuned from a broadband absorber to a reflecting surface due to the insulator-to-metal transition of VO 2 . When VO 2 is in its insulating state, the metasurface can efficiently absorb the normally incident THz wave in the frequency range of 0.535–1.3 THz with the average absorption of ~97.2%. Once the VO 2 is heated up and switched to its fully metallic state, the designed metasurface exhibits broadband and efficient reflection (>80%) in the frequency range from 0.5 to 1.3 THz. Capitalizing on such meta-atom design, we further extend the functionalities by introducing phase-gradients when VO 2 is in its fully metallic state and consequently achieve polarization-insensitive beam-steering and polarization-splitting, while maintaining broadband absorption when VO 2 is in insulating state.

OriginalsprogEngelsk
Artikelnummer5454
TidsskriftScientific Reports
Vol/bind9
ISSN2045-2322
DOI
StatusUdgivet - 1. apr. 2019

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