An active controllable wide-angle and ultra-wideband terahertz absorber/reflector based on VO<sub>2</sub> metamaterial
Yanyu Zhang, Bin Hou, Yongjia Yang, Qianju Song, Zao Yi, Zigang Zhou
Abstract
, and Au). The absorption mechanism based on the impedance matching theory and electric field distribution was investigated, and the influence of structural parameters on the absorption rate and performance of the absorber in a wide wave vector range were analyzed. The study findings showed that the device perfectly absorbed a bandwidth of over 6.0 THz (absorption >90%). The absorption (reflection) was modulated from 0.01 to 0.999 with the change of the background temperature. More importantly, the device could switch between complete ultra-wideband reflection and perfect absorption over a wide angle range. This study provides important insights into the design of terahertz functional devices.