Study On Nonlinear Optical Properties Of Confined Quantum Structures

Nonlinear optics plays an important role in the field of modern optical research.Its main research content is a variety of nonlinear optical effects caused by the interaction between laser and medium.After more than half a century of development,The subject of nonlinear optics is quite mature and has made a series of great achievements in the research process,and also has important applications in the related technical fields.With the cross-development of the discipline,nonlinear optics is penetrating with other fields,combining each other,as a result,many new nonlinear optical phenomena have arisen and attracted people's attention.At the same time,With the deepening of people's research in the microscopic field,it has led to unprecedented developments in nanotechnology.For example,artificial low-dimensional semiconductor structures such as quantum Wells,quantum wires and quantum dots have been artificially prepared in the research of low-dimensional limited quantum structures.Studies have found that this kind of low-dimensional semiconductor nanostructures have more excellent nonlinear optical effects.Therefore,the nonlinear optical properties of this kind of restricted quantum structures are mainly studies in this paper.The first chapter mainly introduces the research background and significance of nonlinear optics,summarizes the research content of this paper,and briefly introduces the theoretical methods used in this research.The second chapter of thesis mainly introduces a type of low-dimensional manual restricted semiconductor structure,such as quantum wells,quantum lines,and quantum points.In this paper,the relevant knowledge is described and the exploration of artificial low dimensional nanomaterials in recent years is introduced.The third chapter we study the optical rectification properties of quantum well with tangent square potential.The system's energy-level and wave function is obtained by solving the system's Schrodinger equation.The expression of the optical rectification coefficient is given by the density matrix and the iterative method.The results show that the peak value of the optical rectification coefficient is gradually smaller as the limiting potential is high,and the peak of the light stream is gradually smaller and moves towards the high energy;When the restriction width is gradually increased,the peak value of the optical rectification coefficient is also increasing,and moving towards the low energy direction.The fourth chapter of the paper studies the light absorption characteristics of an anisotropic parabolic sub-plate in the inclined magnetic field.First,the expression of the system Hamiltonian and the corresponding expressions of energy level and wave function are given.The total optical absorption coefficient of the system is then given by density matrix theory and iterative method.The calculated results show that the change of the confined potential frequency ?x,the parameter ? and the magnetic field inclination ?along the x direction will have a significant effect on the optical absorption coefficient of the quantum disk.Further,when the limit frequency ?x is in a range,the magnetic field incline ? increases,the resonance peak position of the total light absorption coefficient moves towards the area of the high incident photon energy.At the end of the thesis,the calculation results and conclusions of this paper are summarized,and the future work is prospected.Figure[7]table[0]reference[84]...