提出了一种双层半圆介质加载表面等离子激元波导新结构,并利用有限元方法对该新型波导结构在工作波长1550nm下的传输特性进行了数值仿真和优化分析,得到了波导传播特性的主要参数。结果表明:在波导总面积保持不变的情形下,当双层半圆介质的折射率分别取为n1=1.4和n2=1.473时,波导的传播特性最佳;在此折射率参数基础上,波导的内外介质半径比r1/r2为0.5时,波导的传播长度最大、衰减系数最小并且模式面积和品质因数的取值都非常理想,可以获得最优的波导传输效果。 A novel double-layer semi-circular dielectric loaded plasmon waveguide is proposed. The propagation characteristics of the new waveguide structure at 1550nm wavelength are numerically simulated and optimized by finite element method. The main propagating characteristics of the waveguide are obtained. parameter. The results show that the propagation characteristics of the waveguide are best when the refractive index of the bilayer semicircular medium is taken as n1 = 1.4 and n2 = 1.473, respectively, while the total waveguide area remains the same. Based on the refractive index parameters, the waveguide Of the inner and outer media radius ratio r1 / r2 is 0.5, the waveguide maximum propagation length, attenuation coefficient and the minimum model area and quality factor values ​​are very ideal, you can get the best waveguide transmission.