Dynamically tunable multiband plasmon-induced transparency effect based on graphene nanoribbon waveguide coupled with rectangle cavities system  

作　　者：Zi-Hao Zhu Bo-Yun Wang Xiang Yan Yang Liu Qing-Dong Zeng Tao Wang Hua-Qing Yu 朱子豪;王波云;闫香;刘洋;曾庆栋;王涛;余华清(School of Physics and Electronic-information Engineering,Hubei Engineering University,Xiaogan 432000,China;Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]School of Physics and Electronic-information Engineering,Hubei Engineering University,Xiaogan 432000,China [2]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Chinese Physics B》2022年第8期440-452,共13页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11647122 and 61705064);the Natural Science Foundation of Hubei Province,China(Grant Nos.2018CFB672 and 2021CFB607);the Project of the Hubei Provincial Department of Education,China(Grant Nos.B2021215 and T201617);the Natural Science Foundation of Xiaogan City,China(Grant Nos.XGKJ2021010002 and XGKJ2021010003)。

摘　　要：A dynamically tunable multiband plasmon-induced transparency(PIT) effect in a series of rectangle cavities coupled with a graphene nanoribbon waveguide system is investigated theoretically and numerically by tuning the Fermi level of the graphene rectangle cavity. A single-PIT effect is realized using two different methods: one is the direct destructive interference between bright and dark modes, and the other is the indirect coupling through a graphene nanoribbon waveguide. Moreover, dual-PIT effect is obtained by three rectangle cavities side-coupled with a graphene nanoribbon waveguide.Results show that the magnitude of the dual-PIT window can be controlled between 0.21 and 0.74, and the corresponding group index is controlled between 143.2 and 108.6. Furthermore, the triple-PIT effect is achieved by the combination of bright–dark mode coupling and the cavities side-coupled with waveguide mechanism. Thus, sharp PIT windows can be formed, a high transmission is maintained between 0.51 and 0.74, and the corresponding group index is controlled between161.4 and 115.8. Compared with previously proposed graphene-based PIT effects, the size of the introduced structure is less than 0.5 μm2. Particularly, the slow light effect is crucial in the current research. Therefore, a novel approach is introduced toward the realization of optical sensors, optical filters, and slow light and light storage devices with ultra-compact,multiband, and dynamic tunable.

关 键 词：plasmon-induced transparency(PIT) graphene group index rectangle cavities 

分 类 号：O53[理学—等离子体物理] TQ127.11[理学—物理]