Study On The Terahertz Characteristics Of The Graphene Surface Plasmon Polaritons And Array Structure

In order to manipulate the light field,the traditional method is to accumulate the phase difference by introducing the optical path difference and then adjust the polarization state,amplitude and phase.However,the volume of traditional devices is too large to meet the requirements of integration.The artificial array structure designed with metamaterials at the sub-wavelength scale can not only be coupled with the incident light field,so as to achieve the regulation of incident light,but also have a small volume and universal design.However,the array structure made of metal cannot be dynamically adjusted.In terahertz wave,graphene can produce plasmon resonance with incident light,and the surface plasmon polaritons excited by terahertz wave can be dynamically adjusted by applied electric field.Under the above background,this paper first studies the regulation of terahertz wave by the structure of flexible subsurface metal metasurface array.Secondly,regulation of terahertz wave by graphene nanoribbons structure was studied.The main research contents are as follows:(1)The generalized Snell theorem,Fermat principle and other theories were studied,and the v-shaped gradient metasurface array structure was designed.The simulation results show that the working frequency of the array structure is 4.3 THz,and abnormal refraction will occur when the linearly polarized light is incident vertically.The amplitude of anomalously refracted light can be adjusted by means of the interference principle by translating the Structure of The V-shaped array antenna.(2)By deducing the conductivity and dispersion curve of graphene,the regulation principle of external gate pressure on graphene's conductivity is explained,and it is proved that graphene can excite surface isoexciter in terahertz band.(3)The basic properties of graphene were measured.The nanoband structure of graphene was designed through simulation software.It was found that the plasma resonance frequency and strength of graphene could be regulated by controlling the Fermi level and band width of graphene.Through the micro-nano structure made graphene preparation of nanoscale devices.Terahertz near-field microscopy was used to observe the excitation of the surface isoexcitons of graphene nanoribbons.In general,the research on metal V-shaped antenna metasurface in this paper further expands the regulation mode of phase,polarization state and amplitude,and promotes the practical application of metasurface structure in THz detection,modulation and other fields.The research on graphene surface isobiodes further expands the measurement and excitation modes of TERahertz band SPP,providing relevant guidance for the application of graphene surface isobiodes in terahertz biosensors,safety detection,high data rate communication and other fields.