为了在硅衬底上制作全光逻辑元件，实现1.5μm波长的单向透射性，设计了一种基于硅衬底的复合金属光栅，利用光子在不同方向上入射到金属光栅表面时，耦合成表面等离子体的条件不同，通过FDTD数值仿真和优化，通过对光栅结构的优化和调节复合光栅的参数，实现了在1.5μm波段单向透射，正向入射光的透射率可达39%，对应的透射对比率可达9.4。这一研究成果可以应用于全光逻辑回路和全光二极管的设计。

To achieve unidirectional transmission at 1.5μm wavelength for full optical logical element based on silicon substrate, a compound metal grating based on silicon was designed. Different incident directions of the photons onto the surface of the metal grating will cause different conditions for coupling surface plasmons. FDTD numerical simulation and optimization were utilized to adjust the optimum compound grating structure and the corresponding parameters. Experimental results show that the unidirectional transmission at the wavelength of 1.5μm is achieved with a maximum transmission 39% at the selected forward direction and the corresponding transmission contrast rate is up to 9.4.