Theoretical And Experimental Study On Electromagnetic Specific Surface

Metamaterial (MM) is a kind of an artificial material to extend the electromagnetic properties in nature. Based on the concept of effective medium, metamaterial research and design have made significant progress.The development of MMs could be summarized as two clues:the structure of unit cells,’meta-atom’,the order of these ’meta-atoms. On one hand, the structures of unit cells are becoming smaller and smaller, and more and more new materials, such as graphene, are widely used in MMs, which stimulate a lot of quantum effect in MMs. On the other hand, the order of unit cells evolves from homogenous/periodic to the adiabatic, until now abrupt. The breaking of original symmetry and even further introducing new symmetry enlarge the ability to manupulate eletromagnetic waves.In this paper, we employ the theory, simulation, design and experiment to study the surface related phenomenon of MMs, including:Spoof surface plasmon polaritons (Spoof SPPs) as well as the related effects of the effective medium model of the holey metallic surface (HMS), anomalous slowwave surface and its application, the mechanism of gradient meta-surface, and finally some topics on the tight-binding method to describe the local SPPs.This paper is structured as follows:Chapter Ⅰ introduces MMs background researches, following two clues:’meta-atom’ and order. Chapter Ⅱ include some specific theoretial methods and experimental methods to study surface related prolems including, mode-expansion method, tight-binding methods, and the microwave near-field scanning measurements. These methods are developed by our research group.Chapter Ⅲ-Ⅴ is the researching work of mine during Ph. D programe. In chapter Ⅲ, we would present a interesting meta-surface, the holey metallic surface (HMS). In section3.2, we present that the holey metallic surface with fractal-like apertures could support the TM-polarized SPP as well as TE-polarized SPP at the same time, which do not require high-index insertion. Thus, theorically these Spoof SPPs could be realized in any frequency region. In section3.3, we employ microwave experiment and numerical simulation to realize subwavelength surper imaging. In section3.4, we would discuss the role of aperture shape while imaging. Section3.5present the effective medium theory of the HMP with arbitrary shape aperture. In section3.6, we numerically and experimentally deomstrate the slow light effect of an untra-thin meta-surface:HMP with fractal-like shape aperture. It is also proved in this section the light-matter interaction could be enomaously enhanced by the slow light device. At last, in section3.7, we theorically study the mechanism of the slow-light effect of untra-thin meta-surface.Chapter IV is the study of gradient meta-surface. In section4.2, we first develop a mode expansion theory for gradient meta-surface. Then in section4.3, we apply this theory to two applications:linear reflection phase gradient metasurface and parabolic reflection phase gradient metasurface. We find linear reflection phase gradient metasurface could redirect the reflection wave and the parabolic refection phase gradient metasurface could focus a plane wave. In section4.4, we simplify the mode expansion theory and go back to the’local respondse model’by adoping two assumptions. In section4.5, we experimently verify the redirecting effect and focusing effect in section4.3. At last, we employ the experiemet of how to realize the transition from propagating wave to surface wave in section4.6.Chapter V, selected topics on the tight-binding methods. In section5.2, we established a tight-binding formular for dispersive system. Then, we develop a theory on dynamic process based on tight-binding methods.We would give a brif conclusion in Chapter VI.