Open AccessSwitchable dual-band to broadband terahertz metamaterial absorber incorporating a VO2 phase transition
Author(s) -
Tingting Lv,
Guohua Dong,
Chunhua Qin,
Jia Qu,
Bo Lv,
Wenjia Li,
Zheng Zhu,
Yuxiang Li,
Chunying Guan,
Jinhui Shi
Publication year - 2021
Publication title -
optics express
Language(s) - Slovak
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.418020
Subject(s) - materials science , metamaterial , terahertz radiation , metamaterial absorber , optoelectronics , optics , split ring resonator , multi band device , broadband , resonator , absorption (acoustics) , polarization (electrochemistry) , plasmon , tunable metamaterials , physics , telecommunications , chemistry , computer science , antenna (radio) , composite material
We design and demonstrate a thermally switchable terahertz metamaterial absorber consisting of an array of orthogonal coupled split-ring metal resonators involving a VO 2 phase transition. Numerical results indicate that the active metamaterial always absorbs the TE wave in dual-band regardless of insulating and metallic VO 2 , while the insulator-to-metal phase transition enables a switchable effect between dual-band and broadband absorption of the TM wave with the resonant frequency tunability of 33%. Especially under the metallic VO 2 state, the absorption properties are polarization-dependent and exhibit a switching effect between dual-band and broadband absorption with the increase of the polarization angle. The tunable absorption mechanism can be explained by effective impedance theory and electric energy density distributions. The proposed dual-band to broadband metamaterial switching absorber may have broad applications in sensors, imaging and emitters.