Jiang Haoqing, Wang Yue, Cui Zijian, Zhang Xiaoju, Zhu Yongqiang, Zhang Kuang
Key Laboratory of Ultrafast Photoelectric Technology and Terahertz Science in Shaanxi, Xi'an University of Technology, Xi'an 710048, China.
Foundation Department, Engineering University of PAP, Xi'an 710086, China.
Micromachines (Basel). 2022 Apr 30;13(5):715. doi: 10.3390/mi13050715.
Terahertz metamaterial plays a significant role in the development of imaging, sensing, and communications. The function of conventional terahertz metamaterials was fixed after fabrication. They can only achieve a single function and do not have adjustable characteristics, which greatly limits the scalability and practical application of metamaterial. Here, we propose a vanadium dioxide-based terahertz metamaterial device, which is switchable between being a transmitter and an absorber. The transmission and absorption characteristics and temperature tunable properties of phase change metamaterials in the terahertz band were investigated. As the temperature of vanadium dioxide is varied between 20 °C and 80 °C, the device can switch between transmission and quad-band resonance absorption at the terahertz frequency range, with a high transmission rate of over 80% and a peak absorbance of 98.3%, respectively. In addition, when the device acts as an absorber, the proposed metamaterial device is tunable, and the modulation amplitude can reach 94.3%; while the device is used as a transmissive device, the modulation amplitude of the transmission peak at 81%. The results indicate that the proposed metamaterial device can promote the applications of terahertz devices, such as switching, modulation, and sensing.
太赫兹超材料在成像、传感和通信的发展中发挥着重要作用。传统太赫兹超材料的功能在制造后就固定了。它们只能实现单一功能，不具备可调特性，这极大地限制了超材料的可扩展性和实际应用。在此，我们提出一种基于二氧化钒的太赫兹超材料器件，它可以在发射器和吸收器之间切换。研究了相变超材料在太赫兹波段的传输和吸收特性以及温度可调特性。随着二氧化钒的温度在20℃至80℃之间变化，该器件可以在太赫兹频率范围内在传输和四波段共振吸收之间切换，传输率分别高达80%以上，峰值吸收率为98.3%。此外，当该器件用作吸收器时，所提出的超材料器件是可调的，调制幅度可达94.3%；而当该器件用作透射器件时，传输峰值的调制幅度为81%。结果表明，所提出的超材料器件可以促进太赫兹器件在开关、调制和传感等方面的应用。
