Gao Enduo, Li Hongjian, Liu Zhimin, Xiong Cuixiu, Liu Chao, Ruan Banxian, Li Min, Zhang Baihui
Opt Express. 2020 Dec 21;28(26):40013-40023. doi: 10.1364/OE.412061.
A terahertz metasurface consisting of a graphene ribbon and three graphene strips, which can generate a significant triple plasmon-induced transparency (triple-PIT), is proposed to realize a multifunction switch and optical storage. Numerical simulation triple-PIT which is the result of destructive interference between three bright modes and a dark mode can be fitted by coupled mode theory (CMT). The penta-frequency asynchronous and quatary-frequency synchronous switches can be achieved by modulating the graphene Fermi levels. And the switch performance including modulation depth (83.5% < MD < 93.5%) and insertion loss (0.10 dB < IL < 0.26 dB) is great excellent. In addition, the group index of the triple-PIT can be as high as 935, meaning an excellent optical storage is achieved. Thus, the work provides a new method for designing terahertz multi-function switches and optical storages.
提出了一种由石墨烯带和三条石墨烯条组成的太赫兹超表面，该超表面可产生显著的三重表面等离激元诱导透明（triple-PIT），以实现多功能开关和光存储。数值模拟的triple-PIT是三种亮模式和一种暗模式之间相消干涉的结果，可用耦合模理论（CMT）进行拟合。通过调制石墨烯费米能级可实现五频异步和四频同步开关。并且开关性能包括调制深度（83.5% < MD < 93.5%）和插入损耗（0.10 dB < IL < 0.26 dB）非常优异。此外，triple-PIT的群折射率可高达935，这意味着实现了优异的光存储。因此，这项工作为设计太赫兹多功能开关和光存储提供了一种新方法。
