1. Switchable bi-functional metamaterial based on vanadium dioxide for broadband absorption and broadband polarization in terahertz band.
- Author
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Niu, Junhao, Yao, Qianyu, Mo, Wei, Li, Chunhui, and Zhu, Aijun
- Subjects
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VANADIUM dioxide , *METAMATERIALS , *GOLD rings , *ELECTROMAGNETISM - Abstract
A switchable bi-functional optical metamaterial for broadband absorption and broadband cross-polarization conversion is proposed in the terahertz band based on the phase transition of vanadium dioxide (VO 2). When VO 2 is in the metal phase, the designed metamaterial has the function of a broadband absorber. This absorber consists of a VO 2 top structure, a polyimide layer, and VO 2 film. Calculated results show that the absorptance of the absorber is higher than 90% in the 3.33–5.62 THz range. Because of its symmetry, the absorber is insensitive to polarization and maintains high absorptance in incident angles from 0° to 60°. When VO 2 is in the insulator phase, the designed metamaterial has the function of a broadband cross-polarization converter. This polarization converter comprises two gap gold square rings, a polyimide layer, and a gold substrate. The calculated results show that more than 90% cross-polarization conversion can be achieved at the vertical incidence of x and y polarization in the 2.54–4.55 THz range. Nearly 100% cross-polarization conversion can be achieved at 2.62, 3.29, and 4.33 THz. The designed metamaterial has a wide potential application prospect in fields including stealth technology, solar electromagnetism, and radar communication. • Have the dual functions of broadband absorption and broadband polarization. • The switching of dual functions can be realized within similar operating bandwidths. • Function switching can be realized by a small range of temperature changes. • High working efficiency. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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