偏振器
光学
太赫兹辐射
圆极化
极化(电化学)
石墨烯
材料科学
多波段设备
等离子体子
线极化
散射
光电子学
物理
电信
微带线
物理化学
纳米技术
化学
双折射
天线(收音机)
计算机科学
激光器
作者
Yu Fu,Yueke Wang,Guofeng Yang,Qi Qiao,Yongqi Liu
出处
期刊:Optics Express
[The Optical Society]
日期:2021-04-15
卷期号:29 (9): 13373-13373
被引量:22
摘要
In this letter, we propose a dual-band tunable reflective linear-to-circular (LTC) polarization converter, which is composed of a graphene sheet etched with an I-shaped carved-hollow array. In the mid-infrared region, two LTC bands with opposite handedness are simultaneously realized due to the excitation of the three graphene surface plasmon (GSP) modes. The band of line-to-right-circular-polarization (LTRCP) ranges from 9.87 to 11.03THz with ellipticity χ <−0.95, and from 9.69 to 11.36 THz with an axial ratio of less than 3 dB; the band of line-to-left-circular-polarization (LTLCP) ranges from 13.16 to 14.43THz with χ >0.95, and from 12.79 to 14.61 THz with an axial ratio of less than 3 dB. The tunable responses of the reflective polarizer with Fermi energy ( E f ) and electron scattering time ( τ ) are discussed, and especially the perfect LTLCP can be changed to LTRCP with increasing E f . Also, the influences of geometric parameters, incident angle, and polarization angle on the performances of the dual-band LTC are also investigated, and it is found that our polarizer converter shows angle insensitivity. All simulation results are conducted by the finite element method. Our design enriches the research of tunable LTC polarizers and has potential applications in integrated terahertz systems.
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