Research On Surface Plasmon Polaritons Effect Of Au Nanostructure And Micronstructure

Through the subwavelength structure modulation in the surface in nano-scale and micro-scale, it can control wave field along the surface, particularly the control of its interaction with light. It has tuemendous potential applications in the nanotechnology such as nano-photonic devices, integrated optoelectronic chips and so on in the future, thus it has attacted the broad attention. Plasma optics is based on electromagnetic radiation and metal nano-structure interaction caused by conduction electrons below the wavelength scale of a near-field optical enhancement. When the metal size and wavelength coherence equal or more less, the periodic boundary conditions of the crystal will be destroyed, resulting in significant change on light, electricity, magnetism, mechanics and other characteristics and the plasma resonance changing at the meantime. Plasma formed in nano-photonics, the technology in the solar cell battery, high resolution microscopes, pharmaceutical has potential applications. In this paper, the research focused on the nano-scale and micro-scal Au structures and one-dimensional optics feature, including explorations in experiment.First using three different methods we prepared different topographic characteristics of gold structures with nano-scale and micro-scale. One is the AFM tip structures spttering Au surface by direct magnetron sputtering method. Another is the Au particle surface by methods of heat treatment. The third one is Au film stack using by femtosecond laser ablation lithography. The surface topographies of three Au structures are investigated by scanning electronic microscope and inverted microscopes. Based on the result, the former two structure have good parameter control and can be used for the next step.Near field optical analysis used the software OptiFDTD. The electromagnetic effects of conical structure of AFM tip, gold particles, gold surface array illuminated by Gaussian light field were studied. Found that the conical tip structure has enhancement effect on the tip part of the surface and round particles will produce electromagnetic local field enhancement effect around the media, and the two closely particles will have a strong effect of near electromagnetic field due to static capacitor. The nano-particle arrays illuminated by different incident light wavelengths or on different substrate materials will have different effects.Analyze the transmission spectrum of the gold nano-particles structure on silicium substrate, and the reflectance spectroscopy of the gold nano-particle structure on quartz substrate by photometer. Results show that the enhancement field of metal island films enhancement is less than the one of metallic granular films of field factor, which is consistent with the theoretical analysis of the literature. Gold particle size and shape will affect the absorption characteristics. The more spherical shape of particles absorbed, the more beneficial to produce linear optical effects.The nanofabrication on the thin polymethyl methacrylate film by coupling femtosecond laser with a gold plating tip is experiment. The reproducibility of the experiments is tested by the theoretical calculation and the maneuverability of the experiments is analyzed. And the lithography by surface plasmon polaritons using the gold nano-particle is trial. It indicates that the use of local field enhancement effects by metal nanostructure and microstructure to process material is a different method. It is a new processing technology worthy of further research.