Open AccessInfluence of micro-structure on modulation properties in VO2 composite terahertz memory metamaterials
Author(s) -
Ge Li,
Qingli Zhou,
Ge Chen,
Wenxin Liang,
Yuwang Deng,
Changxiang Liu,
Cunlin Zhang,
Jianyu Du,
Kuijuan Jin
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.404082
Subject(s) - terahertz radiation , materials science , metamaterial , terahertz spectroscopy and technology , dielectric , optoelectronics , optics , modulation (music) , hysteresis , condensed matter physics , physics , acoustics
We have grown VO 2 films and combined with terahertz metamaterials to manipulate the memory effect during the insulator-to-metal transition. The temperature-dependent resonant frequency of hybrid structure shows a thermal hysteresis accompanied with frequency shift and bandwidth variation due to the presence of a VO 2 dielectric layer. This frequency memory effect significantly depends on the metallic micro-structure. Further theoretical calculation demonstrates this phenomenon mainly originates from the different coupling strength between VO 2 and metallic structures. Our findings could facilitate the application of VO 2 films in the smart window and dynamical terahertz modulators.