Study On Characteristics Of Hybrid Surface Plasmon Waveguides

Due to the influence of the diffraction limit,the miniaturization of photonic devices is limited.The characteristic of surface plasmon polariton(SPP)which breaks through the diffraction limit provides a solution for the miniaturization of photonic devices.The hybrid surface plasma(HSP)waveguide structure based on spp theory is proposed and designed,which has low transmission loss and strong mode confinement characteristics.It has become the research focus of high integration and low structure size optical devices.In recent years,researches on graphene have found that the graphene surface plasma(GSP)waveguide structure made of graphene has the advantages of low transmission loss,strong mode constraint ability,and graphene has excellent control performance.It has important research significance for miniaturization and integration of photonic devices.Therefore,based on the theory of hybrid surface plasma and graphene surface plasma,two kinds of surface plasma waveguide structures are designed and analyzed.The main contents are as follows:(1)Design a HSP waveguide structure with low transmission loss and strong optical field localization.The Ag film is used to induce the SPP,and coupled with the photon mode in Cd S nanowires to form a new hybrid waveguide mode.The COMSOL simulation platform is used to analyze the electric field distribution and mode characteristics at the ?=1550nm wavelength.The metal ridge structure is added to reduce the transmission loss of the waveguide and enhance the optical field confinement ability,and through the study of the influence of geometric structure parameters on the waveguide mode characteristics,the design of the HSP waveguide structure with low loss and high localization is realized.At the same time,the gain threshold of the waveguide structure is analyzed,and its application in surface plasmon nanolasers is studied.(2)Based on the theory of HSP waveguide and the photoelectric properties of graphene,graphene materials are introduced to realize the excitation and propagation of SPP at the graphene-dielectric interface.Under the working wavelength of ?=1550nm,the simulation and numerical study of GSP waveguide mode characteristics with different geometrical structure sizes and Fermi levels has realized the design of waveguide structure with stronger electric field localization.And through the study of its gain threshold,it provides a reference for the research of low-gain threshold surface plasmon nanolasers.