The Excitation Of SPP In The Dielectric Grating And Its Waveguide

Surface plasmon polaritons are electromagnetic modes that propagate along the surface of a metal, which are localized on the surface of a metal by the interaction of free-electrons and photons.The excitation of surface plasmon will enable people to use conductors such as metal to achieve the active control of light transmission. By altering the surface of the conductors (subwavelength) structure, its properties, especially the interaction with the optical properties such as dispersion relations, excitation mode, and coupling effects can be significantly changed. At present, the surface plasmon is a very important research direction in nano-photonics, and its principles, new effects and the research of its mechanism have fascinated scientists. Because of the unique optical properties of SPPs, its application prospect is very broad, which has been extensive and in-depth research applications in optical storage, light excitation, microscopy, subwavelength optics and bio-photonics.To accurately explore the surface plasmon subwavelength optics, Maxwell equations must be solved exactly, because the SPPs are excited by external electromagnetic fields, which lead to free charge density fluctuation in the metal conductor, resulting in a collective oscillation mode in the form of electromagnetic radiation. This requires that it must meet the basic equation of electromagnetic field. Currently, FDTD method (Finite Difference Time Domain method, FDTD) is a successful numerical simulation to solve Maxwell equations in the time domain.This first chapter introduces the research background and significance of the topic. The second chapter introduces the basic properties of SPPs and principles, including the dispersion relation, characteristic parameters and the excitation mode, and expounds the novel subwavelength optics effect and a number of important applications of SPPs. In chapter 3 we focus on the basic idea and characteristics of the FDTD method. The fourth chapter discusses the excitation characteristics of SPPs in the metal grating. In chapter 5 we research the excitation characteristics of SPPs in the dielectric grating, and review the relationship between the SPPs excitation and the grating depth. In chapter 6 we summarize the thesis work and prospects.The surface plasmon photonics (plasmonics) base on SPPs which contains a very extensive research. With the development of nano-science, the research has become increasingly active, discovers many new phenomena and raises many new issues, which has been showing a great prospect.