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Terahertz Absorber With Reconfigurable Bandwidth Based on Isotropic Vanadium Dioxide Metasurfaces
oleh: Zhengyong Song, Maoliang Wei, Zhisheng Wang, Guoxiong Cai, Yineng Liu, Yuanguo Zhou
Format: | Article |
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Diterbitkan: | IEEE 2019-01-01 |
Deskripsi
The design of a broadband tunable absorber is proposed based on a thin vanadium dioxide metasurface, which is composed of a simple array of vanadium dioxide and a bottom gold film. When the conductivity of vanadium dioxide is equal to 2000 Ω<sup>-1</sup>cm<sup>-1</sup>, simulated absorptance exceeds 90% with 71% bandwidth from 0.47 to 0.99 THz and full width at half maximum is 98% from 0.354 to 1.036 THz with center frequency of 0.695 THz. Simulated results show that absorptance peak can be tuned from 5% to 100% when the conductivity changes continually from 10 Ω<sup>-1</sup>cm<sup>-1</sup> to 2000 Ω<sup>-1</sup>cm<sup>-1</sup>. The designed absorber may have useful applications in terahertz spectrum such as energy harvesting, thermal emitter, and sensing.