使用Rsoft软件中的时域有限差分模块Fullwave分析二维介质波导和等离子波导耦合特性，利用软件仿真耦合结构并自动计算出光在介质波导和等离子波导中传输的耦合效率，进而测绘耦合效率随波导尺寸和光波长的变化曲线图，发现MDM导波结构的缝隙宽度和光通信质量密切相关，在确定尺寸下，传输损耗随传输距离成指数衰减。根据分析得到的耦合效率变化规律发现介质波导和等离子波导间距最佳点都应设为15nm，进而优化波导的几何结构参数后，可以将耦合效率提高到83%。

The properties of the coupling between two-dimensional dielectric slab and plasma waveguides are investigated with finite difference time domain methods based on the Fullwave module of Rsoft software. The coupling structure was simulated with the software and the coupling efficiency of light transmitting in the dielectric slab and plasma waveguides was calculated automatically the coupling, and then the variation curves of the coupling efficiency with the waveguide dimension and the wavelength of the light were drawn out. It is found that the gap width of MDM waveguide structure is related to the quality of the optical communication, and that the optimal point of the dielectric slab and plasma waveguides are all set at 15 nm according to the variation law of the coupling efficiency obtained by analysis. The coupling efficiency can be increased by 83% after further waveguide optimization of the geometric construction parameters.