A Quad-Frequency On–Off Modulator Based on a Simple Graphene Metasurface in Terahertz,Physica Status Solidi-Rapid Research Letters

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A Quad-Frequency On–Off Modulator Based on a Simple Graphene Metasurface in Terahertz
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2021-04-24 , DOI: 10.1002/pssr.202100036
Wei Cui _{1,

2} , Yixuan Wang ₃ , Huqiang Ma ₄ , Hui Xu ₅ , Yi Zao ₆ , Linqiao Li _{1,

2} , Xinliang Cao _{1,

2} , Xincheng Ren _{1,

2} , Zhihui He _{1,

2}

Affiliation

It is necessary to explore the potential applications of surface plasmon polaritons (SPPs) on graphene metasurfaces and enhance the performance of their on–off modulators and slow-light effect. A simple monolayer graphene metasurface is developed for achieving the plasmon-induced transparency (PIT) phenomenon in the terahertz range. PIT can be effectively tuned by the positional parameter, the Fermi level, and the carrier mobility using the finite-difference time-domain (FDTD). Moreover, it is found that a quad-frequency on–off modulator and an outstanding slow-light effect can be realized in this proposed metasurface. Interestingly, modulation depth (MD), insertion loss (IL), ΔT, and the group index are of 98.90%, ≈0.05 dB, 0.97, and 3383, respectively. Hence, the results show that the proposed metasurface has excellent performance for on–off modulators and a slow-light effect, which can provide theoretical guidance for designing terahertz micro-nanophotonic devices.

中文翻译：

基于太赫兹简单石墨烯超表面的四频开关调制器

有必要探索表面等离子体激元（SPP）在石墨烯超表面上的潜在应用，并提高其开关调制器和慢光效应的性能。开发了一种简单的单层石墨烯超表面，用于实现太赫兹范围内的等离子体诱导透明 (PIT) 现象。PIT 可以通过位置参数、费米能级和使用有限差分时域 (FDTD) 的载流子迁移率进行有效调整。此外，发现在该超表面中可以实现四频开关调制器和出色的慢光效果。有趣的是，调制深度（MD）、插入损耗（IL）、ΔT，组指数分别为 98.90%、≈0.05 dB、0.97 和 3383。因此，结果表明，所提出的超表面具有良好的开关调制器性能和慢光效应，可以为设计太赫兹微纳米光子器件提供理论指导。

更新日期：2021-04-24

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