色散介质可调谐周期性结构研究
[Abstract]:With the rapid development of modern communication technology, artificial electromagnetic materials have a very important application in civil and national defense because of their unique control characteristics of electromagnetic wave, so it has become a new research hotspot in electromagnetic field. As a topological structure in artificial electromagnetic materials, periodic structure has attracted much attention. In this paper, photonic crystals and electromagnetically induced transparency in periodic structures are studied. Semiconductor and graphene are introduced in the design of periodic structures. Because the physical properties of semiconductors and graphene can be modulated by many parameters, the use of these two dispersive media to design tunable periodic structures has a great advantage. In this paper, two kinds of periodic structures are designed, they are one-dimensional photonic crystals based on semiconductors and electromagnetically induced transparent structures based on graphene. The transmission and tunable properties of these structures are studied. The research content and innovation of this paper are as follows: 1. Several algorithms used in photonic crystal research are discussed, and the advantages and disadvantages of these algorithms in dealing with different problems are discussed. At the same time, the characteristic matrix method used in this paper is introduced and deduced in detail. The propagation characteristics of one-dimensional unmagnetized semiconductor photonic crystals in terahertz band and omnidirectional photonic band gap (OBG).) are also studied by eigenmatrix method. Because the OBG of the device is not sensitive to the polarization mode and incident angle of incident electromagnetic wave, it can be used to design omnidirectional reflector. We also discuss the influence of various parameters (filling ratio and plasma frequency) on OBG, and design a mode separator based on one-dimensional semiconductor photonic crystal. The magneto-optic Voigt effect of semiconductors is discussed. The physical properties and theoretical models of semiconductor materials under magneto-optic Voigt effect are analyzed. At the same time, when there is an external magnetic field, the physical properties and theoretical models of semiconductor materials are analyzed. The transmission and mode separation characteristics of one-dimensional magnetized semiconductor photonic crystals are discussed. The mode separation frequency band of this structure can be adjusted in a large frequency range. The electromagnetically induced transparent structure based on graphene is studied and designed. The physical properties and theoretical models of graphene are discussed. The influence of various parameters on its dielectric constant is analyzed. The mechanism of electromagnetically induced transparent devices based on graphene is also studied. Its transmission characteristics and the influence of each parameter on its transmission characteristics are analyzed. The tunable characteristics of the structure are also studied. By changing the Fermi energy level, the frequency of the transparent window can be adjusted in a large frequency range without changing the structural parameters.
【学位授予单位】:南京航空航天大学
【学位级别】:硕士
【学位授予年份】:2016
【分类号】:O441;O734
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