In this work, we report a simple and effective method for enhancing the photonic spin Hall effect (SHE) via singularity induced by destructive interference in an ultrathin uniaxial slab. Deriving from anisotropy, the incident angles corresponding to destructive interference for $p$- and $s$-polarized waves will be deviated, leading to an enhancement peak in transverse spin shift. Interestingly, by adjusting the thickness of slab, the destructive interference and the Brewster effect can act together. At this point, the photonic SHE exhibits great singularity, and the maximum transverse spin shift can approach about three times more than that of the Brewster effect acting alone. This Letter reveals the influence of the interference effect on photonic SHE in layered media and provides a simple way to achieve enhanced photonic SHE.

中文翻译：

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通过相消干涉引起的奇点增强光子自旋霍尔效应

在这项工作中，我们报告了一种简单有效的方法，通过超薄单轴板中的相消干涉引起的奇点增强光子自旋霍尔效应（SHE）。从各向异性导出，对应于$p$ - 和$s$ 的相消干涉的入射角-极化波将被偏离，导致横向自旋位移的增强峰。有趣的是，通过调整板坯的厚度，相消干涉和布鲁斯特效应可以共同作用。此时，光子SHE表现出极大的奇异性，最大横向自旋位移可以接近布鲁斯特效应单独作用的三倍左右。这封信揭示了干涉效应对分层介质中光子 SHE 的影响，并提供了一种实现增强光子 SHE 的简单方法。