金纳米颗粒的有序制备及其光学特性

采用纳米球蚀刻技术在石英衬底上制备了不同高度的金纳米颗粒阵列.通过扫描电子显微镜对其表面形貌进行了观测，表明金纳米颗粒为有序分布的三棱柱结构.通过红外—紫外吸收光谱仪在190—900nm波长范围内对其光吸收特性进行了测量, 并成功观测到了金纳米颗粒表面等离子体振荡效应引起的光吸收峰，结果表明随着金纳米颗粒高度的增加，其吸收峰的位置向短波方向移动(蓝移).同时对金纳米颗粒的光吸收特性进行了基于离散偶极子近似的理论计算，并与实验结果进行了比较.关键词：纳米球蚀刻技术金纳米颗粒离散偶极子近似

Fabrication and optical properties of Au nanoparticle array

Using nanosphere lithography and pulsed laser deposition, Au nanoparticles with different height have been fabricated on quartz substrates. The surface images of Au particles were observed by scanning electron microscopy, and the results showed that the prism-shaped Au particles form a periodical array. In the U-V-visible absorption spectrum, strong absorption peaks due to the surface plasmon resonance of Au nanoparticles were observed. Furthermore, theoretical calculation based on the discrete dipole approximation was performed. The experimental and theoretical results show that the absorption peaks of the Au nanoprism shifted to the blue side as the out-of-plane height increases.