材料科学
超材料吸收剂
超材料
光学
极化(电化学)
吸收率
太赫兹辐射
光电子学
宽带
等离子体子
物理
可调谐超材料
反射率
物理化学
化学
作者
Junhao Niu,Qianyu Yao,Wei Mo,Chunhui Li,Aijun Zhu
标识
DOI:10.1016/j.optcom.2022.128953
摘要
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 (VO2). When VO2 is in the metal phase, the designed metamaterial has the function of a broadband absorber. This absorber consists of a VO2 top structure, a polyimide layer, and VO2 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 VO2 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.
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