Chen Huan, Zhang Huiyun, Guo Xiaohan, Liu Shande, Zhang Yuping
Appl Opt. 2018 Feb 1;57(4):752-756. doi: 10.1364/AO.57.000752.
We present a numerical and theoretical study on the realization of tunable plasmon-induced transparency (PIT) effect at terahertz frequencies in Dirac semimetal (known as "three-dimensional graphene") metamaterials. Simulations reveal that the PIT effect is generated by an electric field transferred from the central strip to side strips due to the structural symmetry breaking. The most prominent feature is that the plasmonic resonance in Dirac semimetals can be actively tuned by changing the Fermi energy and an ultrahigh group delay of about 6.81 ps is obtained in our proposed design. Our study can provide guidance for various terahertz devices in practical applications.
我们展示了一项关于在狄拉克半金属（被称为“三维石墨烯”）超材料中实现太赫兹频率下可调谐等离子体诱导透明（PIT）效应的数值和理论研究。模拟结果表明，由于结构对称性破缺，PIT效应是由从中心条带转移到侧边条带的电场产生的。最显著的特征是，狄拉克半金属中的等离子体共振可以通过改变费米能量来主动调谐，并且在我们提出的设计中获得了约6.81皮秒的超高群延迟。我们的研究可为各种太赫兹器件的实际应用提供指导。
