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本文设计并研究了一种关于介质板对称的涂覆石墨烯的领结型纳米线波导结构,利用有限元法(FEM)对波导所支持的表面等离子体激元的传输特性进行研究。通过调整结构的几何参数和电磁参数研究了表面等离激元模式的有效折射率、模式传播长度、归一化模式面积、品质因数以及模式的场分布特性。研究发现,该结构对电磁场模式具有良好的模式束缚特性,传播长度大于2μm,归一化的模式面积接近10-5的量级,并且具有较高的品质因数。这种结构在未来微纳光电器件领域实现超紧密光学集成中具有潜在的应用前景。
In this paper, we design and study a waveguide-grafted nanowire waveguide structure with graphene symmetrical on a dielectric plate. The transmission characteristics of the surface plasmon supported by the waveguide are studied by the finite element method (FEM). The field refractive index, mode propagation length, normalized mode area, quality factor and the field distribution characteristics of the surface plasmon mode are studied by adjusting the geometrical parameters and electromagnetic parameters of the structure. The study found that the structure has good mode-bound properties for the electromagnetic field mode, the propagation length is greater than 2 μm, the normalized mode area is on the order of 10-5, and has a high quality factor. This kind of structure has the potential application prospect in realizing ultra-compact optical integration in the field of future micro and nano optoelectronic devices.