Zhuo Shanshan, Zhou Fengqi, Liu Yanli, Liu Zhimin, Zhang Xiao, Luo Xin, Qin Yipeng, Yang Guangxin, Ji Cheng, Zhou Zizhuo, Sun Liwen, Liu Ting
J Opt Soc Am A Opt Image Sci Vis. 2022 Apr 1;39(4):594-599. doi: 10.1364/JOSAA.452393.
A simple monolayer graphene metamaterial based on silicon/silica substrates is proposed, and typical triple-plasmon-induced transparency (PIT) is realized in the terahertz band. The physical mechanism is analyzed by coupled mode theory (CMT), and the results of CMT agree well with the finite-difference time-domain simulation. A multimode electro-optical switch can be designed by dynamic tuning, and the modulation degrees of its resonant frequencies are 84.0%, 87.3%, 83.0%, 88.1%, and 76.7%. In addition, triple-PIT gradually degenerates into dual-PIT with a decrease in the length of one bright mode. Interestingly, the group index can reach 770 at =0.8, which shows that it can be designed as a slow light device with extraordinary ability. Therefore, the results of this paper are of great significance to the research and design of electro-optical switches and slow light devices in the terahertz band.
提出了一种基于硅/二氧化硅衬底的简单单层石墨烯超材料，并在太赫兹波段实现了典型的三等离子体诱导透明（PIT）。通过耦合模理论（CMT）分析了其物理机制，CMT结果与有限差分时域模拟结果吻合良好。通过动态调谐可以设计出一种多模电光开关，其谐振频率的调制度分别为84.0%、87.3%、83.0%、88.1%和76.7%。此外，随着一个亮模长度的减小，三PIT逐渐退化为双PIT。有趣的是，在 =0.8时群折射率可达770，这表明它可以被设计成一种具有非凡能力的慢光器件。因此，本文的结果对太赫兹波段电光开关和慢光器件的研究与设计具有重要意义。
