Terahertz Absorber With Reconfigurable Bandwidth Based on Isotropic Vanadium Dioxide Metasurfaces

• Published in: IEEE photonics journal Vol. 11; no. 2; pp. 1 - 7
• Main Authors: Song, Zhengyong, Wei, Maoliang, Wang, Zhisheng, Cai, Guoxiong, Liu, Yineng, Zhou, Yuanguo
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.04.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Absorber; Absorbers; Absorptance; Absorption; Absorptivity; Bandwidth; Broadband; Conductivity; Emitters; Energy harvesting; Gold; Impedance; metasurface; Metasurfaces; Permittivity; Vanadium; Vanadium dioxide; vanadium oxide
• ISSN: 1943-0655; 1943-0655; 1943-0647
• DOI: 10.1109/JPHOT.2019.2898981

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 -1 cm -1 , 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 -1 cm -1 to 2000 Ω -1 cm -1 . The designed absorber may have useful applications in terahertz spectrum such as energy harvesting, thermal emitter, and sensing.