Research On Near-field Radiative Heat Transfer Of Multilayer Periodic Structure Based On New Two-dimensional Materials

Because it can exceed the blackbody radiation limit and has some important applications in the technical fields of thermal photovoltaic cells and thermal scanning microscopy,near-field radiative heat transfer has attracted widespread attention in both theory and experiment in recent years.It has been found that for materials that can support surface polaritons(surface plasmon polaritons,surface phonon polaritons),the supported surface modes play an important part in enhancing near-field thermal radiation.In addition,due to the excellent electronic and optical properties of the new-emering two-dimensional(2D)materials(such as graphene and black phosphorus),researches on the near-field radiant heat transfer of these 2D materials have also made important progress.Although these 2D materials can support surface plasmons,these modes are often limited near their resonance frequencies,which limits their application in increasing near-field radiative heat transfer.By alternately arranging graphene and dielectric materials to form a periodic structure,the coupling of surface plasmons from different graphene layers can be achieved to enhance the radiative heat transfer.Macroscopically,the periodic structure composed of graphene and dielectric materials exhibits the properties of hyperbolic metamaterials.Hyperbolic metamaterials can support a wide-band hyperbolic mode,which has more advantages for increasing near-field thermal radiation than surface modes.This thesis mainly studies the near-field radiative heat transfer of multilayer periodic structures based on new two-dimensional materials.The research contents of this paper can be divided into the following parts:Firstly,we introduce the theoretical method of near-field radiative heat transfer which is basedon fluctuation electrodynamics and fluctuation dissipation theorem.The effective medium theory and the transfer matrix method are also introduce in the section.In addition,the optical properties of 2D materials are also analyzed.Secondly,a hyperbolic metamaterial alternately stacked by graphene and silicon carbide(SiC)is proposed.The physical mechanism of near-field radiative heat fluxenhancement between hyperbolic metamaterials was studied in detail.The effects of chemical potential of graphene,thickness of SiC,and spacing on near-field radiative heat flux are analyzed.Finally,we theoretically calculate near-field radiative heat transfer between multilayer structure made of black phosphorus and SiC.The effects of black phosphorus electron doping,spacing,and thickness of SiC on heat flux are analyzed.We continue to calculate the near-field radiative heat transfer between the black phosphorus/silicon carbide multilayer and the graphene-covered silicon carbide bulk.And it is concluded that the near-field radiative heat flux can be maximized when appropriate parameters are selected.