设计了一种基于石墨烯动态调控太赫兹泄漏波的调制器件。通过调节石墨烯费米能级的大小, 改变了金属.介质.石墨烯(MIG)超表面结构的共振响应, 从而达到调控太赫兹泄漏波的功能。仿真结果表明: 随着石墨烯费米能级从 10 meV到 60 meV和介质层厚度从 20 μm到 200 μm的变化, 通过优化电控石墨烯 MIG结构最终实现了 35 GHz的频率扫描范围, 并伴有电磁响应状态从过阻尼至欠阻尼的转变; 在过阻尼状态下结构的电磁响应仅存在共振吸收而在欠阻尼状态下具有类电磁诱导透明现象, 使具有这种显著变化特征的电控石墨烯 MIG结构可应用于高灵敏的生物检测中。本器件具有构型简单、调控方便的特点, 在生物分子和材料折射率检测等方面具有广泛的应用前景。

A terahertz leaky wave modulator based on graphene is designed. By changing the Fermi level of graphene, the resonance response of the metasurface based on metal-insulator-graphene(MIG) structures will be changed significantly, which modulates the properties of the terahertz leaky wave. The simulation results show that with the change of Fermi energy from 10 meV to 60 meV and the thickness of dielectric from 20 μm to 200 μm, the 35 GHz frequency scanning range is finally achieved by optimizing the electro-controlled graphene MIG structure, and the electromagnetic response state is changed from the over-damping state to the under-damping state. Meanwhile, it is found that the phenomenon of electromagnetically induced transparency(EIT) can be induced in the under-damping state, but there is only resonant absorption in the over-damping state. Therefore, the MIG structure with this remarkable feature can be applied to highly sensitive biological detection. The device has the characteristics of simple structure and convenient control. It has a wide application prospect in the detection of biomolecules and material refractive index.