A Thermal-Switchable Metamaterial Absorber Based on the Phase-Change Material of Vanadium Dioxide
Zhongbao Wang,
Yanli Ma,
Ming Li,
Liangfei Wu,
Tiantian Guo,
Yuejun Zheng,
Qiang Chen,
Yunqi Fu
Affiliations
Zhongbao Wang
The College of Electronic Science, National University of Defense Technology, Changsha 410073, China
Yanli Ma
The College of Electronic Science, National University of Defense Technology, Changsha 410073, China
Ming Li
Key Laboratory of Material Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
Liangfei Wu
Key Laboratory of Material Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
Tiantian Guo
The College of Electronic Science, National University of Defense Technology, Changsha 410073, China
Yuejun Zheng
The College of Electronic Science, National University of Defense Technology, Changsha 410073, China
Qiang Chen
The College of Electronic Science, National University of Defense Technology, Changsha 410073, China
Yunqi Fu
The College of Electronic Science, National University of Defense Technology, Changsha 410073, China
This article presents a thermal-switchable metamaterial absorber (TSMA) based on the phase-change material of vanadium dioxide (VO2). VO2 thin film was deposited on sapphire substrate by magnetron sputtering followed by vacuum annealing treatment. Then, the prepared VO2 film was sliced into tiny chips for thermal-switchable elements. The surface structure of TSMA was realized by loading four VO2 chips into a square metallic loop. The absorption frequency of TSMA was located at 7.3 GHz at room temperature and switched to 6.8 GHz when the temperature was heated above the critical phase transition temperature of VO2. A VO2-based TSMA prototype was fabricated and measured to verify this design. The design is expected to be used in metasurface antennas, sensors, detectors, etc.
