超材料表面波特性的研究
[Abstract]:Surface wave is a kind of electromagnetic wave which is confined in a very thin boundary area of two kinds of media and propagates along the plane direction. In the vertical direction of the plane, the amplitude of the wave decreases gradually with the increase of the distance away from the plane. Metamaterial (metamaterial) is an artificial composite structure or composite material with supernormal physical properties which is not possessed by natural materials. It has important applications in electromagnetic stealth, perfect lens and super-resolution imaging. Due to the novel physical properties of metamaterials, the properties of surface waves propagating on their surfaces have naturally attracted people's attention. At present, the design of metamaterial structure is mainly used to control the metamaterial surface wave, but once its structure is designed, it can not be changed, so it is more important to study the regulation of the surface wave. In this paper, the characteristics of surface waves of metamaterials tuned by external physical field are studied. The specific research contents and results are as follows: 1. The nonlinear TE surface wave at the interface of nonlinear supermaterial and superconducting material is studied. Based on the continuity of electromagnetic field at the interface, the dispersion equation of nonlinear surface wave is obtained. The influence of temperature on the dielectric constant of high temperature superconductors is discussed by using a two-fluid model. The equivalent refractive index of surface wave propagation, the energy flow distribution and the position of the maximum soliton field distribution in nonlinear supermaterials are numerically calculated and discussed. The results show that the magnitude of the equivalent refractive index (the propagation velocity of the surface wave) and the position of the maximum soliton amplitude can be tuned by the temperature and the nonlinear term. The position of the soliton peak value is close to the interface with the increasing of the nonlinear term and far away from the interface with the increase of temperature. Surface wave energy is mainly distributed in nonlinear material as soliton, and the energy flow distribution of surface wave in two media can be tuned by changing temperature. 2. The nonlinear TE surface waves at the interface between the supermaterial and the semiconductor material are studied by the external magnetic field. The dispersion relationship of the surface waves is obtained. Based on the In Sb magneto-optical Woithe effect, the control of the external magnetic field and nonlinear terms on the equivalent refractive index, energy flow distribution and the position of the maximum soliton amplitude is numerically calculated and discussed. The results show that the equivalent refractive index increases with the increase of the external magnetic field when the frequency is less than the plasma frequency of the semiconductor, while the equivalent refractive index decreases with the increasing of the external magnetic field when the frequency is larger than the plasma frequency of the semiconductor. The equivalent refractive index increases with the increase of nonlinear term. The peak position of the soliton is close to the interface with the increase of the external magnetic field and the enhancement of the nonlinear term. The distribution of surface wave energy in two media can be tuned by changing the external magnetic field. The results can be applied to the optical isolator. The exact dispersion of nonlinear TM surface waves at the interface between nonlinear material and metamaterial is studied. TM wave is a vector surface wave coupled with two electric field components. The exact dispersion relation of nonlinear surface waves is obtained by the one-order integral method. By comparing the approximate linear solution with the exact dispersion relation, it is found that the dispersion curve deviates by more than 10% in the frequency range under discussion. On this basis, we discuss the law of the change of equivalent dielectric constant, penetration depth of surface wave with the intensity of excited electromagnetic wave field and Kerr coefficient of nonlinear medium.
【學(xué)位授予單位】:南京航空航天大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:O441.4;TB39
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