Research On Electromagnetically Induced Transparent Electromagnetic Characteristics Based On Multimode Coupling

Metamaterials refer to a class of non-natural materials with special properties.The microstructure of these materials does not exist in nature.By artificially designing the structure of such materials,they can obtain electromagnetic properties that conventional materials in nature do not have.The composition of metamaterials itself is not different from traditional materials,and its properties are determined by precise geometric structure,size and arrangement.Electromagnetically induced transparency refers to the quantum interference effect process between atomic energy levels in the microscopic system,which makes an energy transmission window appear in the original energy absorption area.When the medium is exposed to light,the absorption of the first beam of light by the medium will be greatly weakened or no longer absorbed.This phenomenon is called electromagnetically induced transparency,or EIT(Electromagnetically induced transparency)for short.However,due to the extremely harsh conditions required to generate electromagnetically induced transparency under conventional conditions,such as ultra-low temperature and high-power lasers,it is difficult to obtain,which greatly limits the development of electromagnetically induced transparency theory.The emergence of electromagnetic metamaterials solves this problem,making it possible to achieve electromagnetically induced transparency under conventional experimental conditions such as room temperature.Among them,the multi-mode coupling electromagnetically induced transparency phenomenon based on electromagnetic metamaterials can significantly change the characteristics of light,such as slow light effect and dispersion characteristics,etc.,in slow light devices,nonlinear devices,optical data storage,quantum Information technology and sensor fields have potential application value.Using the electromagnetic properties of metamaterials to achieve electromagnetically induced transparency overcomes many limitations in obtaining electromagnetically induced transparency in quantum systems,and has great research value.This paper mainly analyzes and studies the electromagnetically induced transparency phenomenon in the microwave band.Based on the original two excitation modes,a new excitation method is proposed,and a large group index and group delay are obtained.The combination of sensors realizes the function of a high-sensitivity sensor.In addition,on this basis,the coupling model and fitting model are studied,and the correctness of the simulation results is verified theoretically.Finally,for the extension of electromagnetically induced transparency based on multi-mode coupling,the combination of silicon-based semiconductors,graphene,photosensitive silicon,vanadium dioxide and other materials with electromagnetically induced transparent structures has greatly improved the controllability of electromagnetically induced transparent structures.The controllable electromagnetically induced transparent structure was obtained.The main work of this paper is as follows:1.Design of Electromagnetically Induced Transparent Structures Based on Simultaneous Magnetic Field Excitation Based on Clear Mode-Clear Mode Coupling.Based on the bright-bright coupling mode,a new simultaneous magnetic field excitation method is proposed.When the two dielectric plates and the metal resonator structure on the surface of the dielectric plate are placed face to face,the direction of the electric field is consistent with the symmetrical direction of the metal resonator structure,the direction of the magnetic field is perpendicular to the incidence of the two dielectric plates,and two magnetic resonances are excited at the same time,the double U-shaped ring and The interference effect between the double rings leads to the emergence of the electromagnetically induced transparent transmission window,and with the large group delay and group index,the speed of light is significantly reduced,and the slow light effect is obvious.2.On the basis of the designed new structure,the coupling mechanism inside the structure is studied.The electromagnetic characteristics of the designed structure are analyzed by the Lorentz coupling model,the mathematical model of each part of the structure is analyzed separately,and the relationship between the model parameters and the electromagnetic characteristics parameters is analyzed.The theoretical model of the individual structure describes The curve of the composite structure is highly consistent with the actual simulation results,and the curve described by the overall theoretical model of the combined structure is also highly consistent with the curve including the transmission window.The rationality of the designed structure is verified through the analysis of the mathematical model.Combining electromagnetically induced transparency with the sensor realizes a high-performance sensor.Refractive index sensor is one of the potential applications of electromagnetically induced transparency phenomenon,when the environment around the metamaterial changes,the resonant frequency of the metamaterial structure also changes.As the refractive index around the metamaterial changes,the transmission curve also shifts significantly.By detecting the distance of the shift,we can obtain the parameters of the surrounding environment,which has great application prospects in the field of sensors.3.The electronically controlled electromagnetically induced transparent structure is realized by adding materials such as silicon-based semiconductor and graphene to the electromagnetically induced transparent structure.In the electromagnetically induced transparent structure,by adding materials such as silicon-based semiconductors and graphene that can control the conductivity,the position and intensity of the electromagnetically induced transparent transmission peak can be controlled by applying an applied voltage.The light-controlled and temperature-controlled electromagnetically induced transparent structures are formed by combining photosensitive materials and phase-change materials with electromagnetically induced transparent structures.The photosensitive silicon was added to the electromagnetically induced transparent structure to control the transmission peak of the electromagnetically induced transparency by light intensity,and the temperature-controlled electromagnetically induced transparent structure was realized by adding vanadium dioxide.