A terahertz multifunction modulator composed of upper-layer double graphene ribbons and lower-layer a graphene strip, which can generate a Fano resonance produced by hybrid between a broad mode and a narrow mode, is proposed to realize electro-optical switch and filtering function. The electric field distribution, hybrid theory, and quantum level theory are all employed to explain the Fano resonance, whose transmission spectra are fitted by coupled mode theory. In comparison to other graphene-based terahertz modulators, the amplitude modulation degree can reach 99.57%, meaning an excellent electro-optical switch can be realized. Moreover, the extinction ratio of Fano resonance can reach 99.70%, demonstrating an unparalleled electro-optical filter is implemented. Finally, variations in the lateral and longitudinal lengths of the lower-layer a graphene strip enable excellent dual-band, triple-band filters. Thus, this work provides a new way to implement terahertz multi-function mo...

中文翻译：

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基于上层双石墨烯带和下层石墨烯带的太赫兹电光多功能调制器及其耦合机制

为了实现光电开关和滤波功能，提出了由上层双石墨烯带和下层石墨烯带组成的太赫兹多功能调制器，它可以产生由宽模式和窄模式混合产生​​的Fano共振。电场分布，混合理论和量子能级理论都被用来解释法诺共振，其透射光谱通过耦合模理论拟合。与其他基于石墨烯的太赫兹调制器相比，振幅调制度可以达到99.57％，这意味着可以实现出色的电光开关。此外，Fano谐振的消光比可以达到99.70％，这表明实现了无与伦比的电光滤波器。最后，下层石墨烯条的横向和纵向长度的变化可以实现出色的双频，三频滤波器。因此，这项工作提供了一种实现太赫兹多功能模块的新方法。