金属纳米材料因其特有的局域表面等离激元共振(LSPR)特性而广泛应用于半导体材料发光、太阳能电池、表面增强拉曼散射探测、光电化学等领域。Ag由于其在特定波段极低的吸收损耗而被视为优秀的LSPR候选材料。以Ag纳米结构作为研究对象,利用时域有限差分法(FDTD)对圆柱形Ag纳米结构的近场局域增强和远场散射特性进行了系统的模拟与分析。结果表明Ag纳米结构的尺寸、间距及衬底折射率均会对LSPR 效果产生显著影响,可以通过改变结构参数来调控Ag纳米结构的LSPR特性。

Metal nanomaterials are widely used in semiconductor materials luminescence, solar cells, surface enhanced Raman scattering detection, and photochemistry, etc., because of their unique local surface plasmon resonance (LSPR) characteristics. Owing to its very low absorption loss in a particular band, Ag is considered as an excellent candidate material for LSPR. In this paper, the near-field local enhancement and far-field scattering characteristics of cylindrical Ag nanostructures are systematically simulated and analyzed by finite-difference time-domain method (FDTD). The results show that the size, spacing and substrate refractive index of Ag nanostructures have significant effects on the LSPR. Furthermore, the LSPR properties of Ag nanostructures can be regulated by changing of the structural parameters.