Tunable bifunctional terahertz metamaterial device based on Dirac semimetals and vanadium dioxide

A tunable bifunctional terahertz (THz) metamaterial device based on Dirac semimetal films (DSFs) and VO 2 is presented. The insulator-to-metal phase transition of VO 2 enables bifunctional asymmetric transmission and dual-directional absorption to be switched in the THz range. When VO 2 serves as a...

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Bibliographic Details
Published in:Optics express 2020-06, Vol.28 (12), p.17434-17448
Main Authors: Wang, Tongling, Zhang, Huiyun, Zhang, Yong, Zhang, Yuping, Cao, Maoyong
Format: Article
Language:English
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Summary:A tunable bifunctional terahertz (THz) metamaterial device based on Dirac semimetal films (DSFs) and VO 2 is presented. The insulator-to-metal phase transition of VO 2 enables bifunctional asymmetric transmission and dual-directional absorption to be switched in the THz range. When VO 2 serves as a dielectric, tunable broadband asymmetric transmission of linearly polarized THz waves can be achieved. When VO 2 is in a metallic state, the proposed device acts as a tunable dual-directional absorber with perfect absorption in both illumination directions. In each case, the response can be tuned by varying the Fermi energy of the DSFs. This offers a new pathway for the development of tunable multifunctional THz metamaterial devices.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.394784