Regulation Of Near-Field Radiative Heat Transfer Between Multilayer Magneto-Optic Metamaterials By A Perpendicular Magnetic Field

In recent years,with the increasingly urgent demand for miniaturization and intelligence in the electronic information industry,micro-nano-scale thermal management has received more and more attention from researchers.At micro-nano scale,radiative heat transfer is dominated by evanescent waves whose energy is not limited by the wave vector in principle,so that the radiative heat transfer can far exceed Planck's black-body limit.Moreover,because the photon transmission rate is much higher than the electron transmission rate,nano-scale ultra-high-speed information processing can be realized by regulating near-field radiation.Therefore,near-field radiative heat transfer is gradually considered as an effective method for improving the energy utilization efficiency of micro energy systems and thermal management of microelectronic devices.Based on this,this thesis starts from the regulation of near-field radiative heat transfer between multilayer magneto-optical materials,theoretically discusses the influence of external vertical magnetic field on surface waves and hyperbolic modes in multilayer magneto-optical metamaterials,and analyzes the related factors that affect heat transfer,so as to realize bidirectional adjustment of the near-field radiative heat transfer by a lower magnetic field.First,with the help of optical conductivity and permittivity tensor,the influence of magnetic field on the electromagnetic properties of graphene and In Sb is analyzed,and the method of magnetic field control near-field radiation is given.In addition,according to wave electrodynamics and fluctuation dissipation theorem,the electromagnetic field in the multilayer anisotropic medium is analyzed,and the electromagnetic field relationship between two adjacent layers of the medium is established by using the scattering matrix method.Therefore,the calculation method of the near-field radiative heat transfer between the two sets of multilayer anisotropic structures under an external vertical magnetic field is obtained.Secondly,a graphene-SiO₂multilayer hyperbolic metamaterial is proposed,and the near-field radiative heat flow between the two sets of multilayer structures under an external vertical magnetic field was calculated by the above method.The influence of the vertical magnetic field on the near-field radiative heat transfer between multilayer hyperbolic metamaterials was analyzed through spectral heat flow,normalized transmission coefficients,normalized spectral heat flow and relative thermal magnetoresistance ratio.The results show that when the magnetic field B=7 T,the relative thermal magnetoresistance ratio is as high as 78.23%in the case of?=0.05 e V,which means that the magnetic field weakens the near-field radiative heat transfer obviously.For higher chemical potentials(?=0.3e V),the relative thermal magnetoresistance ratio is almost unaffected by the magnetic field.Finally,on the basis of the single magneto-optical multilayer metamaterial,a multilayer metamaterial composed of graphene and In Sb magneto-optical materials is proposed,the coupling effect of different magnetic fields and chemical potential of graphene on the near-field radiative heat transfer between the dual magneto-optical multilayer metamaterials is analyzed.The results show that the radiative heat flux of?=0.5 e V and 0.7 e V is 1.68 and2.86 times of that in the zero magnetic field when B=1 T.When B=7 T,the radiative heat flux of?=0.05e V and 0.1e V decreased by 45.2%and 24.6%,respectively,compared with zero field.Therefore,the combination of magnetic field and chemical potential shows good modulation performance.