Open AccessSwitchable broadband and wide-angular terahertz asymmetric transmission based on a hybrid metal-VO2 metasurface
Author(s) -
Xiaoxiang Dong,
Xingqi Luo,
Yixuan Zhou,
Yuanfu Lu,
Fangrong Hu,
Xinlong Xu,
Guangyuan Li
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.405173
Subject(s) - terahertz radiation , broadband , optics , chirality (physics) , transmission (telecommunications) , bandwidth (computing) , optoelectronics , metamaterial , angular momentum , materials science , physics , telecommunications , chiral symmetry breaking , quantum mechanics , computer science , nambu–jona lasinio model , quark
We propose a switchable broadband and wide-angular terahertz asymmetric transmission based on a spiral metasurface composed of metal and VO 2 hybrid structures. Results show that asymmetric transmission reaching up to 15% can be switched on or off for circularly polarized terahertz waves when the phase of VO 2 transits from the insulting state to the conducting state or reversely. Strikingly, we find that relatively high asymmetric transmission above 10% can be maintained over a broad bandwidth of 2.6-4.0 THz and also over a large incident angular range of 0 ° -45 ° . We further discover that as the incident angle increases, the dominant chirality of the proposed metasurface with VO 2 in the conducting state can shift from intrinsic to extrinsic chirality. We expect this work will advance the engineering of switchable chiral metasurfaces and promote terahertz applications.