Research On Application Of Surface Plasmon In Silver-Molybdenum Disulfide Composite Structure

Surface plasmon is a kind of electromagnetic wave confined to the metal-dielectric interface.It can enhance the local electromagnetic field,break the diffraction limit of light and realize the manipulation of light on the order of nanometers.In recent decades,unlimited new possibilities and new discoveries to various research fields of the interaction between light and matter have been brought by surface plasmons?SPs?of noble metals:surface plasmon imaging,photothermal therapy,enhanced fluorescence,assisted laser processing,enhanced photoelectric conversion efficiency of LED or solar cells.However,how to compensate for the energy loss caused by the ohmic loss of the surface plasmon and increase the transmission distance is still a key issue that needs to be solved urgently in the near-field optical research of surface plasmon.People try to improve the performance of the surface plasmon of noble metals in various ways.Since graphene was acquired in 2004,many two-dimensional materials have been discovered one after another.Among all these materials,the single layer molybdenum disulfide has attracted people's attention because of its natural direct band gap.With the deepening of research,it was found that the composite material produced by the combination of molybdenum disulfide and metal has extremely excellent optical and electrical properties.Accordingly,this paper mainly studies the surface plasmon application of silver nanowire/molybdenum disulfide composite structure.The main research contents include:?1?Molybdenum disulfide with good morphology was prepared by CVD method,and its morphology and Raman spectrum were characterized.The influence on the growth of molybdenum disulfide were analyzed and summarized,they are:the distance between the molybdenum source and the sulfur source,the amount of sulfur powder,the pressure,the constant temperature reaction.In addition,molybdenum disulfide/graphene heterojunctions were also prepared by CVD method and characterized by Raman.?2?A laser confocal microoptical path was established to study the fluorescence transmission of silver nanowire surface plasma-coupled quantum dots,and the difference between surface plasma-enhanced fluorescence and surface plasma transport of two structures?silver nanowire and silver nanowire/molybdenum disulphide composite structure?was compared.It was found that the composite structure significantly enhanced the intensity of the surface plasmon enhanced fluorescence and the transmission distance of the surface plasmon.In addition,the dependence of the surface plasmon properties of the two structures on the polarization of incident light was further studied.?3?A photodetector for molybdenum disulfide/graphene heterojunction was prepared.The photoelectrical properties of the detector were studied and the photoelectrical response mechanism was analyzed.When the source-drain voltage is 10V,the gate voltage is 5 V,illuminated by the 532 nm laser of 8 mW power,the photodetector response reaches 33.41 A/W,and the detection rate reaches 1.35×10¹²Jones.