Cu/CaF_2复合团簇镶嵌薄膜的光学性质

Optical Properties of Cu/CaF_2 Cluster Embedded Thin Films

利用溅射-气体-聚集（SGA）共沉积法，分别在方华膜和光学石英玻璃衬底上制备了Cu团簇嵌理在CaF_2介质中的Cu／CaF_2复合团簇镶嵌薄膜样品。透射电镜（TEM）分析表明，样品为多晶结构；样品的分光光谱仪测量和光Kerr响应表明，Cu金属的表面等离子体共振吸收频率明显依赖于样品中Cu团簇的大小，随着团簇尺寸的减小，样品共振吸收峰发生红移；并且在吸收峰位附近，表现出较大的第三级非线性系数。

The Cu/CaF_2 composite cluster embedded films were grown on both formvar foil and quartz glass sub-strates respectively with sputter-gas-aggregation (SGA) co-deposition .TEM structure characterization revealed that the films are polycrystalline. The optical spectra and the optical Kerr response showed that the surface plasma resonance ab-sorption frequency of Cu varies strongly with Cu cluster size and the resonance absorption peak has a red-shift with re duced Cu cluster sizes.