ABSTRACT

Hyperbolic volume and surface phonon polaritons have been studied extensively for enhancing the near-field radiative heat transfer (NFRHT) between hyperbolic materials. Hyperbolic volume phonon polaritons (HVPPs) describe propagating electromagnetic waves in hyperbolic materials while evanescent waves are required for excitation of hyperbolic surface phonon polaritons (HSPPs). Therefore, the dispersion relations of HVPPs and HSPPs are distinct. Here we study the interaction of HVPPs and HSPPs within the context of NFRHT between hyperbolic materials. We find that the dispersion curves of HVPPs and HSPPs in an ultrathin hyperbolic slab can connect smoothly. Particularly, we find that the topology of HVPPs can be convex and flat, rather than concave, and can be controlled by tuning the thickness of the hyperbolic slab, which has not been reported in published literature. We believe our findings presented here may help to deepen our understanding on the interaction between HVPPs and HSPPs, as well as the knowledge on the topology of HVPPs in hyperbolic materials.

摘要

为了增强双曲线材料之间的近场辐射热传递（NFRHT），对双曲线的体积和表面声子极化子进行了广泛的研究。双曲体积声子极化子（HVPPs）描述了双曲材料中传播的电磁波，而消逝波是激发双曲表面声子极化子（HSPPs）所必需的。因此，HVPP和HSPP的分散关系是不同的。在这里，我们研究了双曲材料之间在NFRHT背景下HVPP和HSPP的相互作用。我们发现，超薄双曲板中HVPPs和HSPPs的色散曲线可以平滑地连接。特别是，我们发现HVPP的拓扑可以是凸的和平坦的，而不是凹的，并且可以通过调整双曲线平板的厚度来控制，在已发表的文献中尚未有报道。我们相信，本文介绍的发现可能有助于加深我们对HVPP和HSPP之间相互作用的了解，以及对双曲线材料中HVPP拓扑结构的了解。