| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Dynamically tunable multiband plasmon-induced transparency effect based on graphene nanoribbon waveguide coupled with rectangle cavities system |
| Zi-Hao Zhu(朱子豪)1,†, Bo-Yun Wang(王波云)1,2,†,‡, Xiang Yan(闫香)1, Yang Liu(刘洋)1, Qing-Dong Zeng(曾庆栋)1, Tao Wang(王涛)2, and Hua-Qing Yu(余华清)1 |
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 |
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Abstract 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 between 161.4 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.
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Received: 11 May 2022
Revised: 01 July 2022
Accepted manuscript online: 05 July 2022
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PACS:
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42.25.Bs
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(Wave propagation, transmission and absorption)
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81.05.ue
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(Graphene)
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47.11.Bc
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(Finite difference methods)
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| Fund: 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), and the Natural Science Foundation of Xiaogan City, China (Grant Nos. XGKJ2021010002 and XGKJ2021010003). |
Corresponding Authors:
Bo-Yun Wang
E-mail: wangboyun@alumni.hust.edu.cn
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Cite this article:
Zi-Hao Zhu(朱子豪), Bo-Yun Wang(王波云), Xiang Yan(闫香), Yang Liu(刘洋), Qing-Dong Zeng(曾庆栋), Tao Wang(王涛), and Hua-Qing Yu(余华清) Dynamically tunable multiband plasmon-induced transparency effect based on graphene nanoribbon waveguide coupled with rectangle cavities system 2022 Chin. Phys. B 31 084210
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