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Near-field radiative heat transfer between uniaxial hyperbolic media: Role of volume and surface phonon polaritons
Journal of Quantitative Spectroscopy and Radiative Transfer ( IF 2.3 ) Pub Date : 2020-09-24 , DOI: 10.1016/j.jqsrt.2020.107337
Xiaohu Wu , Ceji Fu

It has been found that near-field radiative heat transfer (NFRHT) between hyperbolic media, such as hexagonal boron nitride (hBN), can be significantly enhanced due to excitation of hyperbolic volume phonon polaritons (HVPPs) and hyperbolic surface phonon polaritons (HSPPs). However, the role of HVPPs and HSPPs in type I and type II hyperbolic bands has rarely been discussed in depth. In this paper, we investigate the NFRHT between two hBN slabs considering the role of HVPPs and HSPPs. The theoretical analysis and numerical results show that when the optical axis is perpendicular to the material surface, the enhanced NFRHT is attributed to the excitation of HVPPs in both type I and type II hyperbolic bands, while HSPPs cannot be excited in this case. When the optical axis is parallel to the material surface, only HVPPs can be excited in type I hyperbolic band, while both HVPPs and HSPPs can be excited in type II hyperbolic band. In addition, the effect of the slab thickness on the dispersion relations of HVPPs and HSPPs, and on the enhancement of NFRHT is also studied. We believe the results in this paper could help to elucidate the mechanisms and manipulation of enhanced NFRHT between uniaxial hyperbolic materials.



中文翻译:

单轴双曲介质之间的近场辐射传热:体积和表面声子极化子的作用

已经发现,由于双曲体积声子极化子(HVPPs)和双曲表面声子极化子(HSPPs)的激发,双曲介质(例如六边形氮化硼(hBN))之间的近场辐射热传递(NFRHT)可以显着增强。 。但是,很少有关于HVPP和HSPP在I型和II型双曲带中的作用的讨论。在本文中,我们考虑了HVPP和HSPP的作用,研究了两个hBN平板之间的NFRHT。理论分析和数值结果表明,当光轴垂直于材料表面时,增强的NFRHT归因于在I型和II型双曲带中的HVPP的激发,而HSPP在这种情况下不能被激发。当光轴平行于材料表面时,只有HVPP可以在I型双曲带中被激发,而HVPP和HSPP都可以在II型双曲带中被激发。此外,还研究了板坯厚度对HVPP和HSPP的分散关系以及对NFRHT的增强的影响。我们相信本文的结果可以帮助阐明单轴双曲线材料之间增强NFRHT的机理和操纵。

更新日期:2020-10-04
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