High-efficiency and multi-frequency polarization converters based on graphene metasurface with twisting double L-shaped unit structure array

OPTICS COMMUNICATIONS

卷:394

Article

Chen, Ming^1,2  Xiao, Xiaofei²  Chang, Linzi²  Wang, Congyun²  Zhao, Deping² 

[1] Guilin Univ Elect Technol, Guangxi Key Lab Precis Nav Technol & Applicat, Guilin 541004, Guangxi, Peoples R China

[2] Guangxi Expt Ctr Informat Sci, Guilin 541004, Guangxi, Peoples R China

关键词: Graphene;    Metasurface;    Multi-frequency;    Polarizer;    Mid-infrared;   

DOI  :  10.1016/j.optcom.2017.03.008

来源: Elsevier

【 摘 要 】

In this work, a high-efficiency and tunable dual-frequency reflective polarization converter composed of graphene metasurface with twisting double L-shaped unit is firstly realized. Numerical results demonstrate that the device can convert a linearly polarized wave to its cross-polarized wave, and meantime it can also convert to a circularly polarized wave. Subsequently, one thickness of 500 nm SiO2 layer sandwiched by two graphene metasurfaces with similar pattern is stacked on the top of the two-layered structure, a four-frequency efficient reflective polarization converters is realized. Above all, those working frequencies can also be dynamically tuned within a large frequency range by adjusting the Fermi energy of the graphene, without reoptimizing and refabricating the nanostructures, which paves a novel way toward developing a controllable polarization converter for mid-infrared applications.

【 授权许可】

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