涂覆石墨烯的电介质纳米并行线的传输特性

Propagation Properties of Nano Dielectric Parallel Lines Coated with Graphene

设计了一种由涂覆了单层石墨烯的双椭圆电介质纳米并行线构成的表面等离子体光波导,采用有限元方法对其传输特性、电磁参数以及结构参数之间的依赖关系进行了研究。结果表明:随着椭圆的中心距离的增大,有效折射率的实部逐渐减小,传播距离先增大后减小,模式面积逐渐增大;椭圆的半短轴对有效折射率、传播距离和模式面积有微调作用;通过优化计算,减小并行线之间的距离,增加并行线的半短轴的长度,可以达到更好的传输效果;工作频率越高,有效折射率的实部越小,传输距离越短,模式面积越大;温度越高,有效折射率的实部越大,传输距离越短,模式面积越小。研究结果为基于石墨烯材料的表面等离子激元光波导的设计、制作和应用提供了理论基础。

A kind of surface plasmonic waveguide constructed with double elliptical nano dielectric parallel linescoated with graphene is proposed. The dependence of propagation properties on electromagnetic parameters and structure parameters is studied by using the finite element method.The results show that, when the distance between two ellipses is increased, the real part of the effective refractive index is decreased gradually, and the propagation distance is increased first and then is fallen down, and the mode area is increased gradually. The effective refractive index, the propagation length and the mode area can be adjusted finely by the elliptical semi minor axis. It can achieve better transmission effect by reducing the distance between parallel lines and increasing the length of the semi minor axis of the parallel lines through the optimization calculation. The higher the working frequency is, the smaller the real part of the effective refractive index is, the shorter the propagation distance is, and the larger the mode area is. The higher the temperature is, the larger the real part of the effective refractive index is, the shorter the propagation distance is, and the smaller the mode area is. This work provides a theoretical basis for the design, fabrication and application of the surface plasmon waveguide based on graphene material.