Extraction Of Effective Parameters Of Electromagnetic Metamaterials

As the level of integration of mobile communication systems continues to increase,metamaterials have drawn much attention because of the nature of many non-existent materials in nature.The application of metamaterials is getting wider and wider,which arouses more researchers' research on metamaterials.Metamaterials are synthetically constructed structures that are used in revolutionary inventions such as flat-panel lenses with perfect imaging and super-resolution,conversion optics,stealth clothing,and more.In this paper,studied the propagation characteristics of electromagnetic waves in metamaterials and give a theoretical formula for the reverse calculation of the effective parameters of metamaterials.Studied the design and homogenization of bianisotropic metamaterials originated from plannar split-ring resonators,which would potentially meet the requirements of the emerging photonic topological insulators and some other types of extotic photonic materials with nontrival states.We show that the off-diagonal elements in the magneto-electric tensor can be realized by combining the planar split-ring resonators with different orientations.To ease the fabrication process,a layer-by-layer design of metamaterials are verified through effective parameter retrival approach and computer based simulation.With the proposed structure,the complex magneto-electric coupling is realized in layered structures by planar techniques,which may be useful in the terahertz and the optical range.The main work and innovation points of this paper are as follows:(1).The propagation of electromagnetic waves in biaxial anisotropic media is emphatically analyzed,and the expressions of reflection coefficient R and transmission coefficient T are given.(2).A complex biaxially anisotropic metamaterial structure using plane SRR structures is proposed.Because of the limitation of this method,which is not easy to design in the optical frequency band,a layer-by-layer design of biaxially anisotropic metamaterials Method,a 3D complex metamaterial structure with strong biaxial anisotropy has been realized by standard planar lithography technology.(3).According to the theoretical formula of electromagnetic wave propagation,an accurate inversion algorithm is given and validated by the inversion of the electromagnetic parameters of planar anisotropic metamaterials based on plane SRR.At the same time,the design and homogenization of the biaxially anisotropic metamaterial structure,which is based on the concept of laminated structure design,are validated by our proposed inversion algorithm and computer-based simulation.