The Research On The Characteristics Of Surface Electromagnetic Waves In Anisotropic Metamaterials

Surface Electromagnetic Waves (SEMWs) are kinds of electromagnetic waves, which propagate on an interface between two materials with opposite signs of dielectric permittivity or permeability, and whose magnitude decay quickly away from the interface. Because of the property of dispersion and being confined, SEMWs are being intensively explored for their exciting potential in surface optics, data storage and bio-photonics. Metamaterials are new types of artificial dielectric-magnetic materials, which can realize any value of permeability or permittivity theoretically. The propagating waves can reveal many new properties in metamaterials, which bring in many new applications. SEMWs associated with metamaterials have been studied and many unique properties have been demonstrated. It has been verified that TE-and TM-polarized SEWMs can coexist on the interface of metamaterials, which greatly develops the concept of surface optics. At present, the research on the characteristics of SEMWs transmitting in metamaterials concentrates on the isotropic materials, while our work is based on the anisotropic metamaterials. The research work is as follows:Firstly, we work out the dispersion relations and the existent conditions of SEMWs associated with anisotropic metamaterials, and get the relations between the total energy flux and the wave vector under this condition. We find that the existent conditions of TE-and TM-polarized SEWMs are independent in anisotropic metamaterials.Secondly, the reflection and transmission of SEMWs associated with anisotropic metamaterials are researched, through which we find that the negative refraction of SEMWs doesn't demand all the components of the tensors to be negative. Furthermore, the scattering problem of SEMWs could be eliminated by anisotropic metamaterials. We get the conditions of total transmission and the corresponding brewster angle. Based on this condition, we propose a scheme to build a surface polarized beam splitter. The simulations verify the theoretical analyses.Finally, we investigate the vectorial propagation of a surface beam associated with anisotropic metamaterials. We find that under certain conditions, a vertical lateral shift may occur to the surface beam which would never exist in isotropic metamaterials. The direction of the shift can be positive or negative, which depends on the value of the parameters. Being different from the plane beams, the shift of surface beam depends on the ratio of the parameters of the tensor not the single parameters.