Research On Molybdenum Disulfide/Graphene Heterostructure Modulation Of Surface Plasmon

The noble metal surface plasmons can break through the diffraction limit of light to realize the manipulation of light on the nanometer scale,which make it become one of the most promising carriers for the new generation of integrated nanometer optical devices.However,with the rapid development of noble metal surface plasma research in the past decade,researchers have long been not limited to the study of noble metal surface plasmons alone.They have often explored in combination with other materials to explore more application of surface plasmons.The rise of research on two-dimensional materials inevitably aroused people's interest in their coupling with noble metals.In the two-dimensional material transition metal dichalcogenides family,MoS₂ is one of the most deeply studied and most concerned.Research on the coupling and hybrid system of MoS₂ with noble metals and other two-dimensional materials has been made achievement in surface plasmon biosensors,surface-enhanced Raman scattering,modulation of luminescent properties and optoelectronic devices performance,photocatalysis.Similarly,in the field of surface plasmons,the excellent photoelectric characteristics of the composite structure of MoS₂ and metal are also emerging.Therefore,this paper mainly studies the modulation effect of MoS₂/graphene heterostructure on surface plasmons.The main research results are as follows:?1?Prepare layered MoS₂ and MoS₂/graphene heterostructure by different methods and study the surface enhanced scattering ability of silver nanowires influenced by MoS₂ and the surface Raman scattering ability of metallic silver enhanced by MoS₂/graphene.The experimental results show that the coupling of MoS₂ and metallic silver can enhance the scattering ability of metallic silver on the incident light and the electric field of surface plasmons.MoS₂/graphene heterostructure can enhance the Raman scattering ability of metallic silver nanowires on Rhodamines.?2?Using the time-domain finite-difference method to research the electric field distribution and intensity,the effective mode area and the propagation of silver nanowires surface plasmons on the SiO₂ substrate,graphene/SiO₂ substrate and MoS₂/graphene/SiO₂ substrate.The results of the study show that the silver nanowire on the MoS₂/graphene/SiO₂ substrate owns greatest maximum electric field strength,the most obvious energy hot spot effect,high the energy confinement,and the short propagation.The theoretical simulation results can explain the stronger Raman enhancement of the metallic silver wire on the MoS₂/graphene/SiO₂ substrate.The paper further analyzes the effect of MoS₂ thickness on these parameters and finds that as the thickness increases,the maximum intensity of the electric field increases,the localization becomes stronger,and the propagation becomes shorter.?3?Design an active plasmonic device based on graphene doped with monolayer MoS₂,that is,the graphene nanoribbon array structure is periodically arranged on the surface of a monolayer MoS₂.Using simulation software to compare the structure of the reference device undoped MoS₂ in the mid-infrared region,and analyzed the changes of resonant wavelength shift and modulation depth.The results show that MoS₂/graphene system after doping MoS₂ can achieve a resonant wavelength of approximately 3?m red shift and keep nearly invariable modulation depth simultaneously,which will provide new prospects for graphene-based infrared ultrafast active plasmonic devices and THz applications.