Optical Properties Of Metallic Nanostructures Arrays

In recent years, nanomaterials have drawn a great attention due to its special prop-erties. It has shown novel properties, such as magnetic properties, thermal properties, optical properties, electrical properties and so on, which are significantly different with the properties of its bulk counterpart, as the scale of nanomaterials have been close to the wavelength of light, with the special surface area effects. Nano-ordered arrays is a kind of nanostructured material that is arranged by a certain pattern, and it showed a lot of new phenomena and properties, with great application potentials in many fields. Novel physical and chemical properties was found in metal nanoparticles due to surface plasmon resonance, which is an important factor in determining the optical properties of metal nanoparticles. Studying the physical properties of metal nano-array structure, especially optical properties, can help us in providing the physical basis for applications in the photoelectric device, optical circuit.In this paper, the optical properties of several nanomaterials were investigated, in-cluding gold hollow sphere arrays, Ni nanowire arrays, Cu nanowire arrays, Ni/Cu superlattice arrays. We tried to study the effects of different parameters, such as diame-ter of the PS and the gold shell thickness, on the reflectance and fluorescence properties of the gold hollow sphere arrays. We also studied reflection properties of three nanowire arrays above in the visible region and near infrared region at room temperature, and optical reflection properties in the visible region at different temperature.According to our experimental results, we draw the following conclusions:(1) we have observed that there are two peaks at375nm and540nm of reflection spectrum of the gold hollow arrays, and a surface plasmon resonance peak at498nm. We also found a wide fluorescence emission peak in the region of315nm to350nm. The results indicated that shell thickness and diameter of the PS have great influence on reflection and fluorescence of the gold nanosphere arrays, especially on the spectral intensity. Our results showed that the optical properties of gold hollow arrays were different from that of gold nanoparticles.(2) We found that the temperature and the radiation wavelength have great effect on the reflection spectrum of nanowire arrays. The strongest OR can be observed at about T=200K for all samples in visible regime. The OR spectra for these samples show different features in the visible and near-infrared bandwidths. We discuss the physical mechanisms responsible for these interesting experimental findings. This study is relevant to the application of metal nanowire arrays as optical and optoelectronic devices.