A dual-frequency on–off modulator with considerable modulation depth (MD) and relatively low insertion loss (IL) is performed with patterned monolayer graphene metamaterial. Destructive interference in this structure gives rise to the dual plasmon-induced transparency (DPIT) phenomenon. The coupled mode theory, confirmed by simulated values, is comprehensively introduced to expound the physical mechanism of the DPIT effect. In addition, the influences of the Fermi level on the DPIT transmission spectrum and the carrier mobility of graphene on the on–off modulation are researched. It is found that the dual-frequency on–off modulator exhibits remarkable modulation performance on both switches and is easier to fabricate in operation than other multi-layer graphene-based modulators. In the ‘on 1 /off 1 ’ state, the MD and IL are 93%, 0.32 dB, respectively. In the ‘on 2 /off 2 ’ state, the MD and IL are 85%...

中文翻译：

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太赫兹图案化石墨烯超材料中基于双等离激元诱导的透明性的双频开关调制和慢光分析

利用图案化的单层石墨烯超材料执行具有相当大的调制深度（MD）和相对较低的插入损耗（IL）的双频开关调制器。在这种结构中的破坏性干涉引起双重等离子体激元诱导的透明性（DPIT）现象。全面介绍了通过模拟值确认的耦合模式理论，以阐明DPIT效应的物理机制。此外，研究了费米能级对DPIT传输谱和石墨烯载流子迁移率对开关调制的影响。发现双频开-关调制器在两个开关上均表现出卓越的调制性能，并且比其他基于多层石墨烯的调制器更易于制造。在“ on 1 / off 1”状态下，MD和IL为93％，0.32 dB，分别。在“ on 2 / off 2”状态下，MD和IL为85％...