Research On The Near-field Radiant Heat Transfer Between Black Phosphorous Strips Cut In Any Direction

Over the years,with the in-depth development of nanoscience and technology,the phenomenon of increasing the near-field radiative heat transfer between objects through the photon tunneling effect of evanescent waves and the excitation of multiple surface modes have attracted the special attention of many researchers.Because black phosphorous materials can support the highly adjustable properties of surface plasmons and black phosphorous materials,researchers often use them for special aspects of nearfield radiant heat transfer.Black phosphorous(BP)has always been a research hotspot because of its excellent electrical and optical properties and adjustable band gap.In addition,the iso-frequency surface of the dispersion relationship of the hyperbolic metamaterial is a hyperboloid,which has a relatively high near-field radiation broadband.What’s more,the hyperbolic metamaterial can support both p-polarization and s-polarization,and has strong tunability.These characteristics have led researchers to use hyperbolic metamaterials to analyze the relevant physical mechanisms of incoming radiant heat transfer.This paper mainly uses the fluctuation-dissipation theory to analyze and numerically simulate the near-field radiant heat transfer based on the black phosphorous strip structure in a very detailed manner.The near-field radiant heat transfer in the case of two models of symmetrical configuration black phosphorous strips in any direction and asymmetric configuration cropped in any direction is discussed.The effects of the electronic doping concentration,width,mechanical rotation angle,and cutting angle of the strip on the heat transfer coefficient are studied respectively.It is found that the wider the black phosphorous strips,the lower the electron doping concentration,which can enhance the radiant heat transfer coefficient between the symmetrical configuration black phosphorous strips cut in any direction.The radiant heat transfer coefficient between the mechanical rotation angle and the asymmetrical black phosphorous strips is in a monotonous decreasing relationship,which is of great significance for realizing the use of black phosphorous strips to adjust the near-field radiant heat transfer through mechanical rotation.