Manipulating The Electromagnetic Wave With Zero Refractive Index Metamaterials

The design of novel metamaterials, the exploration of electromagnetic(EM) response of the unit-cell structure, and completion of its theoretical system and analytical methods has a very significance in promoting its applications of stealthy material, photoelectric devices, information transmission, microwave radiation, the application of electromagnetic wave directional radiation and so on.In this paper, through the design of the permittivity and permeability of the inner space of the metamaterials can realize the anisotropic zero-index metamaterials. Study on the spatial manipulation of electromagnetic wave, mainly the study of electromagnetic waves theory analysis and numerical simulation. The high controllability of the electromagnetic wave propagation direction and propagation law is realized by means of the anisotropic characteristics of the electromagnetic wave response.The main work and research results of this paper mainly include the following aspects : Design of nano-silver fiber structure metamaterials and using Smith electromagnetic parameter estimation theory to extract the transmission parameters and reflection parameters of the metamaterials, then study on the characteristics of electric resonance of the metamaterials. It is found that the permittivity near zero refraction can be realized in THz wave band. At the same time, the magnetic resonance properties of SRR ring structure are studied. By manipulating the wavefront of the isotropic zero refractive index medium found that the wavefront of the incident wave can be adjusted to any shape with the change of the geometry of the incident wave.Through the design of the metamaterials zero refractive index in different directions to achieve manipulation of electromagnetic wave propagation direction can obtain the desired direction of the directional collimation radiation and the efficiency of the electromagnetic wave.Through the field distribution simulation, it is observed that the control ability of the electromagnetic wave propagation direction can be applied to the directional collimation radiation of the antenna. Meanwhile, the structure of anisotropic zero refraction material can be designed to realize the function of waveform converter.The periodic arrangement of the silver nano fiber is used to form a circular ring shaped radial zero refraction material, and the conclusion is obtained by the numerical simulation of the two-dimensional space.The simulation results showed that the electromagnetic waves radiate omnidirectionally through the radially anisotropic zero-index metamaterials(RAZIM), no matter where the source was located inside the circular ring and how many the sources were.The results demonstrated that a circular ring of the RAZIM can make different excitation sources radiate EM waves omnidirectionally and coherently, the magnetic field intensity is obviously enhanced when the single excitation source is alone, and ultimately achieve omnidirectional spatial power combination.