Research On Structure Design And Tunable Electromagnetic Characteristics Of Electromagnetically Induced Transparency In Metamaterial

Electromagnetic induced transparency(EIT)effect in metamaterials is considered to have a broad application prospects in slow light storage,high sensitivity sensors and polarization conversion of electromagnetic wave owing to it overcome the harsh conditions of EIT in a three-level atomic system such as cryogenic temperatures and stable gas lasers.The EIT effect analogue is one hot issue in the areas of metamaterials.However,EIT effect in metamaterials as an emerging science are still many problems to be solved,and with the deepening study on EIT and related disciplines of material science,the performance and application of EIT in metamaterials are expected in higher requirements,so scientific researchers are still pursuing the research on the new structure,materials,band,phenomenon and generation mechanism of EIT in metamaterials.Therefore,in this paper,according to the researching results and existing problems of EIT in metamaterials,the EIT schemes based on different materials are proposed,and the tunable electromagnetic characteristic of EIT schemes affected by parameters in metamaterial are discussed,analytical model and experimental test method are also used to analyze and verify.These researching results are good for further discussing the application of EIT effects in the corresponding frequency band.An EIT structure based on metal Cu resonators,which are coupling between bright and dark mode,is proposed and simulated in GHz band,the slow light prospect of EIT structure is exhibited.The tunable EIT-like phenomenon affected by displacement of bright mode resonator is analyzed by simulation calculation,two-particle mechanical model and experimental test.The physical mechanism of proposed EIT structure is analyzed.According to the Fermi level of graphene can be dynamically turned through gate voltage,an active tunable EIT structure in graphene,which is coupling between bright and bright mode,is proposed.The physical mechanism and slow light of proposed EIT structure in THz band is analyzed,and active tuning ability of proposed EIT structure is exhibited.The tunable characteristics and method of proposed EIT structure,which remains the fixed transparency peak and various amplitude,or tunable group delay with fixed transparency and high transmission amplitude,are explored.The physical mechanism of above tunable characteristics is explained by two-particle mechanical model.An active tunable EIT structure in graphene,which is coupling between bright and dark mode,is proposed.Distinct EIT like phenomenon can be observed in two perpendicular polarization directions of incident electromagnetic wave in THz band.The parameters and physical mechanism of coupling system are analyzed and verified by two-particle mechanical model,the tunable characteristics of proposed EIT structure are explored by changing Fermi level of graphene and polarization angle.An EIT structure in metal-graphene hybrid metamaterials is proposed.The performances of physical mechanism and slow light in THz band are analyzed,and the tunable characteristics of proposed hybrid EIT structure in resonance amplitude for different Fermi level of graphene are exhibited and verified by transmission of isolated bright mode resonator,absorption of EIT structure,twoparticle mechanical model,effective permittivity and effective permeability respectively.