Simulation Study On Coupling Mode Of Metal-Dielectric-Metal Surface Plating Grating

The surface plasma is an electron-thinning wave which is present in the interface of the metal and the dielectric,which is generated by the interaction of the free-vibrating electrons and the photons along the metal surface,and has strong binding and conduction capability to the electromagnetic wave in the micro-nano structure.The surface plasma has many special effects and phenomena,and is favored by many researchers.Among them,optical devices with sub-wavelength structure,metal-dielectric-metal surface plasmon waveguide structure have more compact structure and stronger binding effect on electromagnetic wave,which has been deeply studied by researchers.There are only zero-order diffraction waves in sub-wavelength grating structure,and its sub-wavelength guided mode resonance effect is widely concerned because of its high diffraction property and simple structure.Note.According to the research of metal-dielectric-metal surface plasmon waveguide structure and sub-wavelength grating waveguide structure,a new waveguide structure composed of sub-wavelength grating structure and metal-dielectric-metal-waveguide structure is modeled and simulated in this paper.The main research contents of this paper are as follows:1.For the metal-dielectric-metal waveguide structure,the grating structure is directly placed on the metal layer to form the metal grating-dielectric-metal waveguide structure.The local effect of the waveguide structure on electromagnetic wave and the transmission effect of the waveguide structure on electromagnetic wave are studied.The effects of different grating structure parameters on the metal grating-dielectric-metal surface plasma are calculated by finite difference time domain method.The influence of waveguide and the optimization of grating structure parameters have achieved 86% transmittance of single-frequency light at 640 nm wavelength.The application prospect of the waveguide structure in optical integration is explored.2.For the metal-dielectric-metal waveguide structure,the dielectric layer of the intermediate layer is made into a dielectric grating structure composed of different dielectric structures to form a metal-dielectric grating-metal surface plasma waveguide.The binding effect of the waveguide structure on the electromagnetic field and the influence of the structural parameters on the surface plasma exciton are studied.Optimizing the structure parameters of dielectric grating to realize the transmission characteristics of plasma on the surface of metal-dielectric grating-metal waveguidestructure,the filtering effect of specific wavelength is up to 99.33%.The filtering characteristics of the band 450nm-480 nm range are more than 94.2%.Two kinds of waveguide structures based on the combination of metal-dielectric-metal waveguide structure and sub-wavelength grating are proposed in this thesis.The research results in this paper provide a design idea for the optimization design of nano-integrated photons,which is based on the combination of metal-dielectric-metal waveguide structures and sub-wavelength gratings.It has certain application value and prospect in the field of integrated optics and optical communication.