各项异性微纳结构近场辐射换热机理与调控方法研究

近场辐射换热是当前工程热物理领域的国际前沿，并可为微纳光电器件的散热以及高效能量转换开辟新的思路。目前各向异性材料已开始应用到微纳光电子器件中，然而国内外对各向异性微纳结构近场辐射换热的研究尚未报道，存在近场热辐射模型缺乏、换热机理不清晰以及调控方法不明确等重大挑战，相关研究亟待开展。本项目围绕各向异性微纳结构近场辐射换热机理以及调控方法进行研究，主要包括：拓展目前的近场热辐射理论，建立一维和二维各向异性微纳结构的近场热辐射模型；研究各向异性对表面等离子共振以及非共振双曲模式色散方程的影响，阐明各向异性微纳结构的近场辐射换热机理；提出外场与各向异性微纳结构近场热辐射相互作用模型，分析外加电场或磁场强度以及方向对辐射换热速率以及光谱分布的影响规律，建立基于外场的各向异性微纳结构近场热辐射调控方法。本项目为近场热辐射在各向异性微纳器件散热以及能量转换等方面的应用提供重要的基础理论支撑。

The investigation of near-field thermal radiation is the cutting-edge research in the engineering thermophysics discipline. It opens new possibilities for solving the heat dissipation problems of compact micro/nanoscale optoelectronic devices and developing efficient energy conversion techniques. Currently, anisotropic materials have been applied in optoelectronic devices, however, the near-field thermal radiation between anisotropic nanostructures has not been reported due to lacking appropriate near-field radiation models, unclear heat transfer mechanism, and uncertain control methods, making further investigations imperative. This project will conduct researches on the near-field radiative heat transfer mechanisms and active control of anisotropic micro/nanostructures. Current near-field radiation theories will be expanded to consider anisotropic optical properties, the near-field thermal radiation models for both one-dimensional and two-dimensional anisotropic nanostructures are then established. After that, the effects of anisotropy on the excitation of surface plasmon plaritons and non-resonant hyperbolic modes will be analyzed, and the near-field radiative heat transfer mechanism between anisotropic nanostructures will be illustrated. Finally, the applicant will study how the external electric or magnetic fields affect the transport of evanescent waves, based on which the active control method of near-field radiation of micro/nanostructures will be put forward. This project will lay the foundation of applying near-field thermal radiation in heat dissipation and efficient energy conversion in anisotropic optoelectronic devices.