Two Dyakonov-like polaritons (DLPs) were found in the hexagonal boron nitride (hBN). DLP-I lies in the lower reststrahlen band (RB-I) where the hBN is a hyperbolic material, but DLP-II exists in a narrower frequency region where the hBN is an elliptical material, adjacent to the higher reststrahlen band (RB-II). After uniformly considering the DLP electromagnetic fields on the two sides of the hBN surface, we found that the two DLPs are highly confined in the hBN, and even are completely confined in a certain wave-vector. And also, the Poynting vector of either DLP in the hBN seriously deviates from its wave vector and the directional difference outside and inside the hBN dramatically changes with the distance from the surface. The above extraordinary results can support some potential applications in the mid-infrared range, such as high-efficient energy conduction, strictly manipulating infrared-ray direction and infrared-filtering as well as continuous light-splittingfrom micro-meter to nano-meter dimensions.

在六方氮化硼（hBN）中发现了两个Dyakonov型极化子（DLP）。DLP-I位于较低的reststrahlen带（RB-I），其中hBN是双曲线材料，但是DLP-II存在于较窄的频率区域，其中hBN是椭圆形材料，与较高的reststrahlen带（RB-II）相邻）。统一考虑hBN表面两侧的DLP电磁场后，我们发现这两个DLP高度局限在hBN中，甚至完全局限在一定的波矢中。而且，hBN中任一DLP的Poynting矢量都严重偏离其波矢量，并且hBN内外的方向差异随与表面的距离而急剧变化。以上非凡的结果可以支持某些在中红外范围内的潜在应用，