The Research Of Metamaterials Based On Graphene Surface Plasmon In Mid-Infrared

Surface plasmons?SPPs?are generated by the coupling of incident light and collective oscillations of free electrons and propagate along metal and dielectric surfaces.In recent years,scientists have found that graphene can also support SPPs in the terahertz to mid-infrared range,and graphene surface plasmon has the advantages of high tunability,high locality and large field enhancement.Therefore,graphene surface plasmon is an ideal material for high performance electronic devices in the mid-infrared range.This paper mainly studies the graphene surface plasmon in the mid-infrared frequency,and designs related metamaterials to explore its properties and applications.The main work contents are as follows:Firstly,this paper studys the basic properties of graphene and graphene surface plasmon,describes the conductivity of graphene and the excitation of graphene surface plasmon.It provides conditions for designing high performance mid-infrared graphene surface plasma metamaterials.Secondly,based on the above theory,we propose a tunable graphene metamaterial structure based on plasmon hybridization effect,which can excite dual-band resonance in the mid-infrared frequency.We studied the effects of structural parameters on the dual-band curves and discussed the tunability of this metamaterial.And we studied the performance of the proposed metamaterial for sensing.The calculation results show that the sensitivity of the dual-band curves can reach 550cm^-1/RIU,and the FOM can reach 20.4.This research can promote the development of multi-substance sensing.Finally,we use plasmon-induced transparency?PIT?effect to design two graphene surface plasmon metamaterials for the mid-infrared region,which are ring-symmetric sector disk structures and SRR-double nanoribbon structures.We explain the principles of PIT for two structures and analyze their effects on the tunability and structural parameters.We discussed its performance for sensing.The calculation results show that the sensitivity of the ring-symmetric sector disk structure metamaterial can reach 574 cm^-1/RIU,and the FOM is about 28.7.The sensitivity of the SRR-double nanoribbon structure metamaterial can reach 300cm^-1/RIU,and the FOM is about 21.4.Therefore,both structures can achieve highly sensitive sensing applications.