Journal
OPTICS COMMUNICATIONS
Volume 464, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2020.125494
Keywords
Absorber; Metamaterial; Terahertz; Vanadium dioxide
Categories
Funding
- National Natural Science Foundation of China (NSFC) [11974294]
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A novel wideband absorber is proposed based on a square-shaped vanadium dioxide metamaterial at terahertz frequencies. Full-wave simulation shows that absorptance is greater than 90% in the range of 1.436-3.448 THz, and relative bandwidth ratio is 82.4% at the center frequency of 2.442 THz. With the increasing of the conductivity of VO2, absorption peak increases obviously enabling a large range of tunability from 3.4% to 100%. The thickness of the designed absorber is similar to lambda/7.9. Polarization independence and angular immunity of the designed absorber are systematically described by numerical results. Our design may find potential applications in switch and modulator.
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