Electrically Triggered VO2 Reconfigurable Metasurface for Amplitude and Phase Modulation of Terahertz Wave
Electrically Triggered VO2 Reconfigurable Metasurface for Amplitude and Phase Modulation of Terahertz Wave
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DOI：
10.1109/jlt.2021.3068395
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发表时间：
2021-06
影响因子：
4.7
通讯作者：
Mingzhu Jiang;Fangrong Hu;Longhui Zhang;Baogang Quan;Weilin Xu;Haotian Du;Duan Xie;Ying Chen
中科院分区：
文献类型：
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作者：
Mingzhu Jiang;Fangrong Hu;Longhui Zhang;Baogang Quan;Weilin Xu;Haotian Du;Duan Xie;Ying Chen
主动控制太赫兹波的振幅和相位对于太赫兹宽带无线通信和高分辨率太赫兹成像具有重要意义。本文提出了一种基于电触发二氧化钒（VO 2）可重构超颖表面的太赫兹幅度和相位调制器。该器件的晶胞由蓝宝石衬底上的三个同心开口环（SRR）组成，即，一个VO 2开口环（VSR）和两个金属SRR。VSR嵌入在两个金属SRR之间。通过电触发VO 2的绝缘体-金属转变（IMT），可以动态地控制谐振模式、谐振强度和表面电流分布。该样品是使用表面微加工工艺制造的，其特征在于太赫兹时域光谱（TDS）系统。实验结果表明，在70 GHz的宽带内实现了90 °相移。同时，振幅调制深度达到71%，在0.79太赫兹。通过等效电路模型计算传输和相移，并同时使用基于矩量法（MoM）的全波电路仿真软件进行仿真。计算和模拟结果与实验结果一致。该器件在太赫兹成像、宽带无线通信和阵列相位控制等方面具有潜在的应用价值。
Actively controlling the amplitude and phase of terahertz (THz) wave is of great significance for THz broadband wireless communication and high-resolution THz imaging. In this paper, we present a THz amplitude and phase modulator based on electrically triggered vanadium dioxide (VO2) reconfigurable metasurface. The unit cell of the device consists of three concentric split-rings-rings (SRRs) on the sapphire substrate, i.e., one VO2-split-ring (VSR) and two metal SRRs. The VSR is embedded between two metal SRRs. The resonance mode, resonance intensity and surface current distribution in the unit cell can be dynamically manipulated by electrically triggering the insulator-to-metal-transition (IMT) of the VO2. The sample is fabricated using a surface micromachining process and characterized by a THz time-domain-spectroscopy (TDS) system. The experimental results show that, 90 degrees phase shift is achieved in a broad bandwidth of 70 GHz. Meanwhile, the amplitude modulation depth reaches 71% at 0.79 THz. The transmission and the phase shift are calculated by an equivalent circuit model, and simultaneously simulated using a full-wave circuit simulation software based on the Method of Moments (MoM). The calculation and simulation results agree with the experimental results. The device has potential applications in THz imaging, broadband wireless communications and array phase controlling.