Journal
RESULTS IN PHYSICS
Volume 19, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.rinp.2020.103384
Keywords
Metamaterial; Terahertz (THz); Broadband absorber; Vanadium dioxide (VO2); Dynamically adjustable absorber
Funding
- National Natural Science Foundation of China [11574059, 61965005]
- Natural Science Foundation of Guangxi, China [2018GXNSFAA050043]
- Guangxi Special Expert Program and Innovation Project of Guangxi Graduate Education, China [2019YCXS088, 2019YCXS094]
- Guangxi Key Laboratory of Automatic Detection Technology and Instrument, China [YQ16101]
- Innovation Project of Guangxi Graduate Education, China [2020YCXS093]
- GUET Excellent Graduate Thesis Program [18YJPYSS22]
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A dynamically adjustable terahertz (THz) broadband absorber based on a vanadium dioxide (VO2) hybrid metamaterial is theoretically designed. During the design, we first consider working frequency, bandwidth, excitation method and fabrication process. And then, a commercialized full wave electromagnetic (EM) calculation software CST microwave 2019 based on finite integration technology is used to simulate and optimize the performance of the device. Due to the device is excited by light, it consists of a top layer of VO2 oblique-split ring-resonator (OSRR) array, a polyimide (PI) spacer and a bottom metal film. The simulation results show that, when the VO2 changes from insulating state to metal state under light stimulus, the absorption increases from 3% to over 90%. Meanwhile, when the VO2 is in metallic phase, the bandwidth of absorption greater than 90% reaches to 1.0 THz and the relative bandwidth is about 83%. The potential applications of the device are active EM stealth, THz wave detection and thermal imaging. This work paves a new way for simply constructing a low-cost dynamically adjustable THz broadband absorber.
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