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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 surface plasmon optical waveguide consisting of double-elliptical dielectric nano-parallel lines coated with single-layer graphene was designed. The dependence of the transmission characteristics, electromagnetic parameters and structural parameters was studied using finite element method. The results show that the real part of the effective refractive index decreases with the increase of the center distance of the ellipse, the propagation distance firstly increases and then decreases, and the area of the model gradually increases. The effective half- And the mode area has a fine tuning effect; by optimizing the calculation, reducing the distance between the parallel lines and increasing the length of the semi-minor axis of the parallel lines, a better transmission effect can be achieved; the higher the operating frequency, the real part of the effective refractive index Small, shorter transmission distance, the larger the mode area; the higher the temperature, the larger the real part of the effective refractive index, the shorter the transmission distance, the smaller the mode area. The results provide a theoretical basis for the design, fabrication and application of surface plasmon waveguide based on graphene.