Open AccessTunable bifunctional terahertz metamaterial device based on Dirac semimetals and vanadium dioxide
Author(s) -
Tongling Wang,
Huiyun Zhang,
Yong Zhang,
Yuping Zhang,
Xingzhen Bai
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.394784
Subject(s) - terahertz radiation , metamaterial , materials science , optoelectronics , bifunctional , optics , terahertz spectroscopy and technology , split ring resonator , physics , biochemistry , chemistry , catalysis
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.