Research On The Surface Plasmon Optical Properties Of Special Periodic Metallic Nanostructures

The latest researches demonstrate that the resonant surface plasmon(SP) can be stimulated over the patterned metallic nanostructures by incident radiation, and then the arrayed surface light field can be restricted in nanometer-scale space, so as to remarkably break through so-called light diffraction limit. As the micro-nano-structural size of the patterned SP and surface electron density wave could be affected by several factors including metal atomic microstructure, energy dissipation, and the light dispersion, a new method for realizing nano-scale light concentrating and light energy delivering can be expected for the continuous development of nano-photonics and nano-optoelectronic setup. The SP optical properties of special periodic metallic nano-structures have been researched detailed in this dissertation. Four particular period nano-structures have been designed and fabricated using two different nano-processes, and their reflectance and radiation near-field characteristics have been measured and analyzed carefully according to Fourier microscopic infrared instrument and the scattering near-field optical microscope. Obvious near-field light emission and nano-scale light field enhancement for breaking through light diffraction limit have been observed clearly. The main work of the dissertation is as follows:1. Based on the properties of localization and energy enhancing of SP, several factors including the energy consumption, quality factor, dispersion relations, excited manners, and their interaction, have been analyzed, and then the availability and scalability of the classical metal free-electron gas model and the finite difference frequency domain(FDFD) algorithm have been discussed. Two typical SP application approaches with typical characteristics of breaking through light diffraction limit for realizing super-high density optical storage have been given, and finally the feasibility of using SP to promote the development of nano-photonics and nano-optoelectronic device combining the technological process and testing evaluation, have been analyzed.2. According to the simulation and data analysis, the feasibility of expressing SP intensity through light reflectance measurement, and further several factors, which affect the light reflectance in limited frequency range, including typical nano-structural patterns, nano-materials, substrate configuration, and duty cycle, have been discussed.3. Using the simulations of periodic metallic nanostructures, four nano-structures patterns have been designed and fabricated utilizing electron beam lithography and focused ion beam micro-nano-fabrication. The effectiveness of both nano-processes as above is analyzed.4. Using infrared microspectrography and scattering near-field optical measurement, the reflectance properties of four nano-patterns are measured, and the near-field light characteristics at the wavelengths of 633 nm and 10.274?m are observed, respectively, so as to prove the reliability and seasonality of the entire process used, and thus lay a concrete foundation for further development.