School of Physics and Electronics, Central South University, Changsha 410083, China.
Phys Chem Chem Phys. 2018 Oct 17;20(40):25959-25966. doi: 10.1039/c8cp04484h.
We propose a simulated terahertz design based on planar graphene ribbons. With numerical simulation, we can achieve a very obvious dual plasmon-induced transparency phenomenon through the destructive interference in this structure. Moreover, due to the simple design of this structure and the complete continuous graphene ribbons, the Fermi level of graphene can be regulated by voltage. Thus, the dual plasmon-induced transparency phenomenon can be easily tuned in the numerical simulation. Further structural analysis shows that the two graphene chips on the side of the graphene ribbons play a crucial role in the dual plasmon-induced transparency phenomenon. As the length of the two chips is close, the dual plasmon-induced transparency phenomenon gradually becomes a single plasmon-induced transparency phenomenon. The theoretical analysis of this structure shows that this system has a very high group index, and its maximum value is 800, which is far greater than that of other types of slow light devices. This work may open up a new way for designing tunable terahertz graphene-based devices and slow light devices.
我们提出了一种基于平面石墨烯条带的太赫兹模拟设计。通过数值模拟，我们可以通过该结构中的相消干涉实现非常明显的双等离子体诱导透明现象。此外，由于这种结构的设计简单，并且石墨烯的连续完整的 ribbons，石墨烯的费米能级可以通过电压进行调节。因此，在数值模拟中可以很容易地调谐双等离子体诱导透明现象。进一步的结构分析表明，石墨烯条带两侧的两个石墨烯芯片在双等离子体诱导透明现象中起着至关重要的作用。随着两个芯片长度的接近，双等离子体诱导透明现象逐渐变为单等离子体诱导透明现象。对该结构的理论分析表明，该系统具有非常高的群折射率，其最大值为 800，远大于其他类型的慢光器件。这项工作可能为设计可调谐太赫兹基于石墨烯的器件和慢光器件开辟新途径。
