| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Tunable terahertz slow-light device based on triple plasmon-induced transparency on a patterned graphene metasurface |
| Bo-Yun Wang(王波云)1,2,†, Yao-Yang Dai(代耀阳)1, De-Bing Long(龙德兵)1, 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 The present study proposes a reconfigurable metasurface comprising four graphene rectangles together with five graphene strips, designed to achieve triple plasmon-induced transparency (PIT). The coupled mode theory-based theoretical analysis demonstrates a high level of agreement with finite-difference time-domain simulation results. This graphene-based triple-PIT device enables dynamic tuning of its Fermi level and carrier mobility. For the prepared triple-PIT system, the group index varies from 1134 to 2020 with increasing graphene Fermi level in the range of 0.8-1.2 eV. Conversely, the group index ranges from 1123 to 2079 with increasing graphene carrier mobility in the range of 2.5-4.5 m$^{2}$/(V$\cdot$s). Additionally, the maximum group index (2079) of this device is achieved at the 1.0 eV Fermi level and the 4.5 m$^{2}$/(V$\cdot$s) carrier mobility, which markedly exceeds that of conventional terahertz slow-light structures. Furthermore, the device exhibits good tolerance to design and fabrication deviations. It thus provides useful design guidance for high-performance terahertz slow-light devices.
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Received: 21 May 2026
Revised: 25 June 2026
Accepted manuscript online: 07 July 2026
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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: This project is supported by the National Natural Science Foundation of China (Grant No. 11647122), the Natural Science Foundation of Hubei Province, China (Grant No. 2022CFB475), and the Project of the Hubei Provincial Department of Education, China (Grant Nos. B2021215 and T201617). |
Corresponding Authors:
Bo-Yun Wang
E-mail: wangboyun@alumni.hust.edu.cn
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Cite this article:
Bo-Yun Wang(王波云), Yao-Yang Dai(代耀阳), De-Bing Long(龙德兵), and Hua-Qing Yu(余华清) Tunable terahertz slow-light device based on triple plasmon-induced transparency on a patterned graphene metasurface 2026 Chin. Phys. B 35 084211
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