Abstract

We proposed a multifunctional terahertz metasurface based on a double L-shaped pattern and a vanadium dioxide (VO₂) film separated by polyimide. When the VO₂ film is an insulator, a dual-band electromagnetically induced transparency effect is obtained, and the physical mechanism is investigated based on the current distribution and “two-particle” model. When the VO₂ film is a metal, a dual-band linear-to-circular polarization converter, in which the y-polarized linear wave can be effectively converted to left-handed circularly polarized (LCP) and right-handed circularly polarized simultaneously in different bands, can be achieved. By arranging the metal pattern rotating 30°, a multifunctional antenna can be obtained. When the VO₂ is an insulator, the radiation of the LCP wave is divided into four beams, with two beams reflected and two beams transmitted. When the VO₂ is in the metallic state, we can only get the co-polarized reflected wave with a 21° angle. Moreover, in our design, the VO₂ film does not need lithography to obtain certain patterns, which improves the convenience of fabrication and experiment. Our design opens a new way for the development of multifunctional terahertz devices and has potential applications in the terahertz communication field.

© 2022 Chinese Laser Press

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