论文标题
紧密界限和光损失在极化介导的近场传热中的作用
Tight bounds and the role of optical loss in polariton-mediated near-field heat transfer
论文作者
论文摘要
我们引入了一个分析框架，用于散装等离子和极性培养基中的近场辐射传热。考虑到材料分散，我们得出了辐射热电导的封闭形式表达，该表达将光学损失与其他材料分散特征的作用（例如极地介电中的RESTSTRAHLEN带的光谱宽度以及温度）。我们提供了一种通用条件，以最大化传热，该条件定义了材料的光损耗与极化共振频率之间的最佳相互作用，我们将紧密的边界引入近场传热。借助这种形式主义，可以根据近场热发射器的性能进行定量评估所有极化材料。
We introduce an analytical framework for near-field radiative heat transfer in bulk plasmonic and polar media. Considering material dispersion, we derive a closed-form expression for the radiative thermal conductance, which disentangles the role of optical loss from other material dispersion characteristics, such as the spectral width of the Reststrahlen band in polar dielectrics, as well as from the temperature. We provide a universal condition for maximizing heat transfer that defines the optimal interplay between a material's optical loss and polariton resonance frequency, based on which we introduce tight bounds to near-field heat transfer. With this formalism, one can quantitatively evaluate all polaritonic materials in terms of their performance as near-field thermal emitters.
