| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Dual-channel tunable near-infrared absorption enhancement with graphene induced by coupled modes of topological interface states |
| Zeng-Ping Su(苏增平)1,2, Tong-Tong Wei(魏彤彤)1,2, and Yue-Ke Wang(王跃科)1,2,† |
1 Optical Information Science and Technology Department, Jiangnan University, Wuxi 214122, China;
2 Optoelectronic Engineering and Technology Research Center, Jiangnan University, Wuxi 214122, China |
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Abstract The dual-channel nearly perfect absorption is realized by the coupled modes of topological interface states (TIS) in the near-infrared range. An all-dielectric layered heterostructure composed of photonic crystals (PhC)/graphene/PhC/graphene/PhC on GaAs substrate is proposed to excite the TIS at the interface of adjacent PhC with opposite topological properties. Based on finite element method (FEM) and transfer matrix method (TMM), the dual-channel absorption can be modulated by the periodic number of middle PhC, Fermi level of graphene, and angle of incident light (TE and TM polarizations). Especially, by fine-tuning the Fermi level of graphene around 0.4 eV, the absorption of both channels can be switched rapidly and synchronously. This design is hopefully integrated into silicon-based chips to control light.
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Received: 06 October 2021
Revised: 27 March 2022
Accepted manuscript online: 14 April 2022
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PACS:
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78.67.Pt
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(Multilayers; superlattices; photonic structures; metamaterials)
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42.70.Qs
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(Photonic bandgap materials)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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78.67.Wj
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(Optical properties of graphene)
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| Fund: This project was supported by Postgraduate Research & Practice Innovation Program of Jiangsu Province, China (Grant No. KYCX20 1929). |
Corresponding Authors:
Yue-Ke Wang
E-mail: ykwang@jiangnan.edu.cn
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Cite this article:
Zeng-Ping Su(苏增平), Tong-Tong Wei(魏彤彤), and Yue-Ke Wang(王跃科) Dual-channel tunable near-infrared absorption enhancement with graphene induced by coupled modes of topological interface states 2022 Chin. Phys. B 31 087804
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