石墨烯
超材料
材料科学
光电子学
太赫兹辐射
光电效应
等离子体子
光学
调幅
调制(音乐)
消光比
光调制器
频率调制
相位调制
物理
无线电频率
电信
波长
纳米技术
相位噪声
计算机科学
声学
作者
Xiao Zhang,Zhimin Liu,Zhenbin Zhang,Enduo Gao,Fengqi Zhou,Xin Luo,Jiawei Wang,Yuqing Wang
摘要
A multilayer patterned graphene metamaterial composed of rectangular graphene, square graphene, and X-shaped graphene is proposed to achieve dual plasmon-induced transparency (PIT) at terahertz frequency. The coupled mode theory calculations are highly consistent with the finite-difference time-domain numerical results. Interestingly, a photoelectric switch has been realized, whose extinction ratio and modulation degree of amplitude can be 7.77 dB and 83.3% with the insertion loss of 7.2%. In addition, any dips can be modulated by tuning the Fermi levels of three graphene layers with minor or ignorable changes of the other two dips. The modulation degrees of frequency are 8.0%, 7.4% and 11.7%, respectively, which can be used to design a triple-mode frequency modulator. Moreover, the group index of the multilayer structure can be as high as 150. Therefore, it is reasonable to believe that a multifunctional device can be realized by the proposed structure.
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