Photoinduced active terahertz metamaterials with nanostructured vanadium dioxide film deposited by sol-gel method.
Photoinduced active terahertz metamaterials with nanostructured vanadium dioxide film deposited by sol-gel method.
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DOI：
10.1364/oe.22.011070
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发表时间：
2014-05
期刊：
影响因子：
3.8
通讯作者：
Yaxin Zhang;S. Qiao;Linlin Sun;Qiwu Shi;Wanxia Huang;Ling Li;Ziqiang Yang
中科院分区：
文献类型：
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作者：
Yaxin Zhang;S. Qiao;Linlin Sun;Qiwu Shi;Wanxia Huang;Ling Li;Ziqiang Yang
利用二氧化钒（VO₂）的光激发特性，提出了一种将VO₂薄膜与双共振超材料相结合的动态共振太赫兹（THz）功能器件，以实现超快的外部空间太赫兹波有源调控。所设计的超材料在双共振频率之间的0.28 - 0.36太赫兹处实现了一个通带，并且利用VO₂薄膜来控制空间太赫兹波的透射率。在静态实验中观察到超过80%的调制深度，动态实验结果表明，这种有源超材料在没有任何低噪声放大装置的情况下，实现了在0.34太赫兹载波上加载高达1兆赫兹的调幅信号。这种结构的电磁特性和光诱导动态特性在太赫兹功能组件中可能有许多潜在应用，包括调制器、智能开关和传感器。
Applying the photoexcitation characteristics of vanadium dioxide (VO(2)), a dynamic resonant terahertz (THz) functional device with the combination of VO(2) film and dual-resonance metamaterial was suggested to realize the ultrafast external spatial THz wave active manipulation. The designed metamaterial realizes a pass band at 0.28-0.36 THz between the dual-resonant frequencies, and the VO(2) film is applied to control the transmittance of the spatial THz wave. More than an 80% modulation depth has been observed in the statics experiment, and the dynamic experimental results illustrate that this active metamaterial realizes up to a 1 MHz amplitude modulation signal loaded on a 0.34 THz carrier wave without any low noise amplified devices. The electromagnetic properties and photoinduced dynamic characteristics of this structure may have many potential applications in THz functional components, including modulators, intelligent switches, and sensors.