Photonic Structure Imaging Was Used To Focus On Study

Along with the development of nanotechnology, people have great interested on the nanometer scale of optical phenomena, it leads to a hot research area of nano-optics and nano-photonics (nanophotonics). The surface plasma (SP) wave exist at interface between metal and the dielectric. The local micro-nano metal structures can form highly enhanced evanescent wave at near field. For transmission components, SP wave can form transmission enhancing effect at exit plane of the structures. It is the people’s great concern, and thus become the hot spot of the present research topics. The surface plasma resonance have two types of resonance patterns, one type is the metal surface plasmon resonance. It embodies the nature of surface plasma polaritons (SPPs). The other is local surface plasmon resonance (LSPR). It reflects the nature of local surface plasma. Therefore, considering the formation and the propagation characteristics of SPPs, we developed subwavelength structures based on the nano-photonic devices; On the basis of the field limited role of LSPR, surface plasmon resonance (SPR) will be limited in tiny metal structure or near the surface area. According to the characteristics of the two aspects, this thesis mainly discusses from the following two aspects, one is study of the nanometer circle of surface plasma lens focused imaging, and the other is study of nanowire arrays-based surface plasma lens working in terms of negative refraction. The above two missues is this mainly content in the thesis.1. In order to explore the surface plasma-based imaging effect with super resolution, we put forth the nano-circlular plasma lenses for super focusing. Metal materials are aluminum, gold, and silver. This thesis uses the finite difference time domain (FDTD) algorithm and the corresponding commercial professional software (FDTD Solutions7.5) for the numerical simulation. After computation, we analyzed the nature of the lens focusing. The simulation and analyses show that, since the role of SPPs, this circular structure can realize light focusing or imaging with high strength. Meanwhile, when aperture radius of the metal material changes, the transmission of light properties and focus on imaging effect changes. Our results demonstrate that focuing properties of the lens with aluminum material is better than that of gold and silver. These features could illustrate that aluminum material can be used for nano-photolithography with high resolution.2. In order to study negative refraction-based lens structure, we studied the gold nanowire arrays structure model. It explores the negative refraction of structure from the view point of nano-fabrication. The lenses with metallic subwavelength structure work in visible regime. Through the simulation, we design the structures in terms of the changes of optimized line length, radius, cycle, filling medium refractive index, and other parameters. In addition to the effect of produce negative refractive, we calculated the spectrum of the lenses. All of the calculation results confirm that the negative refraction can be realized in visible band, To further explore the filled refractive index of materials variation, the calculation of the electric field intensity and refraction angle was carried out with a close relationship among the filling materials.