Nonlinear Optical Properties In Semiconductor Double Quantum Wires Coupled To A Quantum-sized Metal Nanoparticle

Since the advent of laser,nonlinear optics has aroused great interest,but also in theoretical research and application has a huge development.In recent years,with the deepening of theoretical research and the development of micro nano machining technology,the preparation of a variety of low-dimensional semiconductor materials in line with the application of science and technology has become a research hotspot.Therefore,low dimensional semiconductor materials with great potential,such as superlattices,quantum wells,quantum wires,quantum dots and so on,have been studied because of their low threshold power,fast response rate and obvious nonlinear optical coefficient.At the same time,people pursue the semiconductor devices with higher accuracy,faster response,more durable,more stable and smaller structure volume.The theory and technology application of nonlinear optics are in line with expectations.Materials related to new technologies such as photonic crystals,carbon nanotubes,graphene,superconductors,topological insulators and so on are being further optimized to adapt to the development.Based on the above factors,the nonlinear optical properties of the hybrid system of metal nanoparticles and double quantum wires are studied.This paper consists of four chapters.The first chapter is the introduction.This paper introduces some common phenomena of nonlinear optics,research development and application,basic knowledge,research development and application of plasmon,basic application and development prospect of low dimensional nano materials.In Chaper 2,we calculate the quantum modified dielectric function under the quantum size effect and the interaction between the metal nanoparticles and the quantum wires.Secondly,we calculate the energy level and the wave function form of the coupling system,and then use the density matrix and the The expressions of linear and nonlinear optical absorption coefficient and refractive index are derived by iterative method.In Chapter 3,we use the expressions and numerical solutions of the above-mentioned quantum modified dielectric function under the coupled quantum wire system model of metal nanoparticles,draw the image,and study the third-order nonlinear optical properties under the coupling alloy nanoparticle model between two quantum wires made of GaAs.The influence of the size of the quantum wire,the size of the metal nanoparticles,the distance between the quantum wires or the incident light intensity on the nonlinear optical properties of the hybrid system is discussed.Chapter four is for the summary and the expectation.We will draw the main conclusions and give the contents of our research.