周期性石墨烯盘表面拓扑边界传输态研究

为了提高光学器件的传输性能,推动微型光学器件及大规模集成光路的发展,提出了一种新型2-D石墨烯等离子体光子晶体结构.通过周期性排列蜂窝状的石墨烯盘,调整一个周期内两个石墨烯圆盘的直径,打开狄拉克点;基于有限元法,运用COMSOL仿真光场传播、计算光子带隙,打破时间反演对称性,实现能带拓扑效应.结果表明,该设计的晶格常数...

Research on topological boundary transmission state on the surface of periodic graphene disk

In order to improve the transmission performance of optical devices and promote the development of micro-optical devices and large-scale integrated optical circuits, a new type of 2-D graphene plasma photonic crystal structure was proposed. By periodically arranging the honeycomb-shaped graphene discs, the diameter of two graphene discs in a period was adjusted to open the Dirac point; based on the finite element method, the propagation of the light field was simulated by COMSOL and the photonic band gap was then calculated. Through breaking the time inversion symmetry, the band topology effect was achieved. The results show that the lattice constants of this designed are all on the order of nanometers, which is nearly 30 times smaller than the free space wavelength with the advantages of miniaturization and high integration. The structure can be dynamically modulated in the 15.3THz~15.8THz frequency range. This research provides a reference for the design of robust nano-scale photonic devices, and is expected to be applied to waveguide frequency control, optical switches and other fields.