期刊
NANOMATERIALS
卷 12, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/nano12173022
关键词
plasmon-induced transparency; graphene; polarization beam splitter; polarization-sensitive; metamaterials
类别
资金
- National Natural Science Foundation of China [61765004, 62165004, 61805053]
- Innovation Project of GUET Graduate Education [2022YCXS047, 2021YCXS040]
- Open Fund of Foshan University, Research Fund of Guangdong Hong KongMacao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology [2020B1212030010]
In this study, a graphene metasurface-based and multifunctional polarization beam splitter that is dynamically tunable was proposed. The unique structure of the splitter enables triple plasma-induced transparency (PIT), and synchronous or asynchronous six-mode electro-optical switching modulation can be achieved by modifying the Fermi levels of graphene. Furthermore, by varying the polarization angle, a polarization-sensitive, tunable polarization beam splitter was realized.
Based on coupled-mode theory (CMT) and the finite-difference time-domain (FDTD) approach, we propose a graphene metasurface-based and multifunctional polarization beam splitter that is dynamically tunable. The structure, comprising two graphene strips at the top and bottom and four triangular graphene blocks in the center layer, can achieve triple plasma-induced transparency (PIT). In a single polarization state, the computational results reveal that synchronous or asynchronous six-mode electro-optical switching modulation may be performed by modifying the Fermi levels of graphene, with a maximum modulation degree of amplitude (MDA) of 97.6% at 5.148 THz. In addition, by varying the polarization angle, a polarization-sensitive, tunable polarization beam splitter (PBS) with an extinction ratio and insertion loss of 19.6 dB and 0.35 dB at 6.143 THz, respectively, and a frequency modulation degree of 25.2% was realized. Combining PIT with polarization sensitivity provides a viable platform and concept for developing graphene metasurface-based multifunctional and tunable polarization devices.
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