半壳结构金纳米膜的局域表面等离子体共振效应

Localized surface plasmon resonance of half-shell gold film

采用纳米模版印刷术和化学自组装技术制备了半壳结构的金粒子膜.利用场发射扫描电子显微镜和光谱仪等测试手段对样品的结构和光学性质进行了分析.研究发现,该结构的金膜所具有独特的局域表面等离子体共振效应取决于样品的粒子大小、间距等微观结构,且其峰值吸收波长对其周围环境介质的介电常数变化十分敏感.实验结果表明,粒子排列均匀的亚单层膜结构是控制光学性质稳定的关键.

The half-shell gold particle film was fabricated by nanolithography and self-assembly monolayer technique. The structures and the unique optical properties of the films were studied by scanning electron microscope and spectrometer. It was found that the localized surface plasmon resonance effect was determined by particle size and the inter-particle distance. The peak extinction wavelength is sensitive to the surrounding dielectric constant. The experimental results showed that the structure uniformity is the key to obtain stable optical properties.