| Recent intense interest in metal nanowires and other nanostructures stems from their novel properties-optical, electronic, thermal, magnetic, and mechanical. Due to the small size effect and special structures, they can provide an additional degree of freedom in modulating their localized surface-plasmon (LSP) modes via changing the parameters. Thus, they are the promising devices for electric, optic, and electric-optic. In this thesis, we focus on the optical properties of Cu nanowire arrays and microscopic gold hollow spheres via the experimental studies, and also contrast the data with bulk materials to deeply understand the optical properties of nanomaterials and its prospect application.To the best of our knowledge, the studies of metal nanowire arrays in infrafed bandwidths are scarcely. Firstly, the reflection property for four diameters of Cu nanowire arrays in near-infrared and far-infrared bandwidths are investigated. These experimental findings suggest that the far-infrared reflection spectra are in the regime for localized surface-plasmon models. Furthermore, the localized surface-plasmon resonance (LSPR) peak shifted with increasing the diameter, but near-infrared reflection property is out of the regime for LSPR. The temperature and diameter of the sample have a significant influence in modulating the reflection spectra of Cu nanowire arrays in near-infrared bandwidths. Secondly, the reflectance and photoluminescence (PL) spectra of the forthed gold hollow nanosphere in visible bandwidths are measured. The results indicated that two distinct surface-plasmon resonance (SPR) peaks onset at520nm and696nm, which red-shifted with decreasing the density (the diameter is fixed). A strong PL emission peak is observed in574nm. When the density (diameter) is fixed, the diameter (density) produces a linear decrease in fluorescence intensity but no change in the wavelength of maximum emission. We hope that these interesting experimental findings from this study can help us to gain an deeply understanding of optical properties of nanomaterials and can provide a physical base for potential applications of metal nanomaterials as advanced electric-electric, electric-optic, and surface plasma devices. |
