提出了一种复式晶格二维石墨烯等离子激元晶体结构, 该结构由包含4个石墨烯纳米盘的原胞周期性排列组成。通过有限元法迭代求解本征频率, 得到了石墨烯等离子激元晶体的能带结构和态密度。数值仿真结果表明, 所提出的结构存在完全光子带隙, 带隙宽度可达5.7 THz, 且其位置和带宽可以通过改变石墨烯的化学势来调谐。该结构可以应用在高密度表面等离子激元集成回路和等离激元片内交叉互联技术中。

A composite lattice two-dimensional graphene plasmon polariton crystal structure is proposed, which composed of periodically arranged primitive cells with four graphene nanodisks. The energy-band structure and density of states of graphene plasmon polariton crystals are obtained by iteratively solving the eigenfrequencies with the finite element method. The numerical simulation results show that, in the proposed structure, there exists a complete photonic bandgap with a bandgap width of 5.7 THz, and the position and width of this bandgap can be tuned by modifying the chemical potential of graphene. The proposed structure can be applied in the techniques such as high density surface plasmon polariton integrated circuit and on-chip plasmon polariton interconnection.