中文摘要：

基于不同金属材料表面等离子激元耦合激发的传播深度和传播距离,提出选择器件材料的标准,其中银表现出最佳的特性.以入射波长为1050nm的p偏振光为例,利用时域有限差分方法,模拟了p偏振光高斯光束入射到金属银亚波长狭缝与光栅结构的传播特性,证明这种结构具有透射增强及定向耦合输出功能.入射面光栅对输出光的主要贡献是透射增强,出射面光栅主要对输出光的远场分布特性产生影响,光栅凹槽数目和深度对透射增强作用具有最佳化参数,透射强度与亚波长狭缝深度之间的关系呈周期性变化特性.

英文摘要：

The selection criterion for device material was presented based on the coupled wave propagation depth and propagation distance of different metal material surface.Silver has the best characteristics.The propagation characteristic of light wave in sub-wavelength slit surrounded by periodic grating corrugations for the p-polarized Gaussian beam of wavelength 1 050 nm,as an example,was simulated through the finite difference time domain method.Transmission enhancement and self-collimation phenomena in such device were achieved.The grating in incidence surface contributed to the transmission enhancement,and the grating in exit surface affected on far-field distribution of intensity.The number and the depth of the dented grooves in the grating had optimum parameters.The relation between transmission intensity and sub-wavelength slit depth had periodicity characteristic.