Open AccessUltra-wideband tunable metamaterial perfect absorber based on vanadium dioxide
Author(s) -
Guo-Zhang Wu,
Xiaohong Jiao,
Yuandong Wang,
Zeping Zhao,
Yibo Wang,
Jianguo Liu
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.416227
Subject(s) - terahertz radiation , materials science , metamaterial , wideband , optics , metamaterial absorber , absorptance , bandwidth (computing) , absorption (acoustics) , impedance matching , optoelectronics , dielectric , electrical impedance , telecommunications , physics , tunable metamaterials , quantum mechanics , computer science , reflectivity
A dynamically adjustable ultra-wideband metamaterial perfect absorber (MPA) is proposed which consists of three resonance rings based on vanadium dioxide (VO 2 ) and a metal ground layer separated by a dielectric spacer. The simulation results show that the terahertz (THz) absorption bandwidth of more than 90% absorptance reaches 3.30 THz, which covers from 2.34 to 5.64 THz, under different incident polarization angles. The range is better than that of previous VO 2 -based reports. Moreover, when the conductivity of VO 2 changes from 200 S/m to 2×10 5 S/m, the absorption peak intensity can be adjusted continuously from 4% to 100%. The key is to optimize the geometric structure through interference cancellation and impedance matching theory, to achieve better absorption bandwidth and efficiency. Besides, the terahertz absorber has a wide-angle absorption effect both in TE and TM waves. Thus, the designed absorber may have many potential applications in modulating, sensing and imaging technology.