The Design Of Nano Optical Natenna Microstructure

Nano-optics is a new discipline to study the interaction between light and matter.This thesis discusses the character of the microstructure material.We study three aspects including optical antenna,two-dimensional photonic crystal and negative refraction materials by using software simulation and establish the model of the microstructure materials.We explore the optical characteristics of micro-structure by analyzing the theoretical data.This thesis includes the following aspects:(1)We perform the theory analysis of optical antenna including the near-field and far-field optical characteristics.We build two optical antenna structures.The first one is spherical structure and the second one is cruciform structures.We analyze the absorption,scattering,extinction characteristics of optical antenna in the near-field and the direction of radiation in the far-field.In addition,we analyze the influence of dipole spontaneous emission due to nano-optical antenna.(2)We present an idea of the two-dimensional photonic crystal absolute band gap optimization.First,we put a dipole into the unit cell of the two-dimensional photonic crystal.Second,we use the optimization module of software to change the distribution of refractive index of the unit cell.Finally,we obtain the absolute maximum value of the two-dimensional photonic crystal band gap.The absolute band gap can reach to about 0.2(2?c/a).In addition,we also design a microstructure material and possess negative refraction phenomenon when the frequency of incident electromagnetic wave is between 540THz to 580THz.In summary,this thesis theoretical analysis a variety of nano-optical microstructures.It is important significance for nano-optics.