Sport Specific Electromagnetic Properties Of The Medium Studied

Light is the energy source of the lives. We may say that there aren't nowadays na-ture without light. Light is so important to us, but human always have different views on the light. In 1864, Maxwell founded the electromagnetical theory. He pointed out that the light is a kind of electromagnetic waves, and then this prediction was proved by the experiment. Thus people understood the light clearer. People aim to manipu-late the light as understanding them, so it can give us more convenience. According to the Maxwell's equations we can find there are two parameters permittivityεand permeabilityμ, which can be used to manipulate the light efficiently. However, we despairingly found that the nature gave us so few materials. For example, there are some materials withε< 0,μ> 0, like metal, and some materials withε> 0,μ> 0, like the dielectrics. Also there are some materials withμ< 0, like ferromagnetic, but they have very large loss and a very narrow band width. Obviously, the nature gives us so few materials and can't supply the demand of human. In 1968, V. G. Veselago, a physicist from Union of Soviet Socialist Republics, in theory presented the materials with both negativeεand negativeμ, and he predicted there were many anomalous effects in these materials. This idea haven't attracted many attentions for many years. Until 90th in last century, J. B. Pendry, a physicist from England, presented that we can realize negativeεbased on finite metallic wires and negativeμbased on the split metallic rings. Combining these two units we can get both negative materials in micro wave region, and soon this idea was proved by an experiment which was carried out by American physicist D. R. Smith. So people understood the capabilities of manipu-lation light based on these subwavelength structures. This direction opens up as a new research region named Metamaterials. Different from the natural materials, this kind of materials can improve the human's abilities of manipulating light and many anom-alous effects can be realized in them, such as reversed Doppler effects and reversed Cerenkov effects. In the first chapter of this thesis, I will give a simple introduction on the progress of metamaterials research and some research hot recently.Metamaterials have some advantages comparing with natural materials, such as negative refraction, and a metamaterial slab can be a super lens. However, almost all the researches are presented in the static environment. So if we put a metamaterial slab in a moving environment what will happen? Of course, we first think the Doppler effects. When both the source and receiver were putted near the surface of the slab and were moving, and then we found the received signals are very novel. Except one peak corresponding to the classical Doppler effect, other peaks were totally out of our imagination. We also got the relation between these anomalous peaks and the work-ing frequencies of source, and the velocities of them. At last we found these peaks result from the interaction between the source and surface waves of the slab. In the sec-ond chapter of this thesis, based on 4D Lorentz transformation, we present a rigorous Green's function approach which can be applied to solve movement-based problem.In the third chapter of this thesis, we discuss in detail the optical phenomena related to a moving metamaterial slab. We can deal with the above anomalous Doppler effects based on such approach, furthermore also can treat the super lensing effects of a mov-ing metamaterial slab. Comparing with the static slab, we found the image resolution change much. It was originated from the surface wave dispersion distortion when the slab was moving. This can directly cause the changing of image point collecting surface wave components.The constitutive relations of chiral media are different from the traditional materials. The electric and magnetic components are coupling together in chiral media. When the electromagnetic waves are propagating in them, the electric (magnetic) field can induce both the electric (magnetic) polarization and magnetic (electric) polarization. As the realization of negative refraction, we need to create the material with both negativeεand negativeμsimultaneously. Actually, it's difficult to do especially in optical region. However, based on chiral media, we can reduce the difficulties, and this point attracted many attentions. In the fourth chapter of this thesis, we will discuss the chiral properties of the metallic split rings. We found the chirality parameter of such metallic split rings based materials can have off diagonal terms. Many researches only focused on the diagonal terms of chirality parameter, so what's new phenomena will occur in such media? We studied the refraction properties between air and such media. There was double refraction, but different from other double refraction, one refracted wave is linearly polarized and another is longitudinal elliptically polarized. At last, based on the full wave simulation, we predicted this effect.In the fifth chapter of this thesis,1 will give a simple conclusion.