Extraordinary Young’s interference is an anomalous phenomenon observed at metallic surface in 2004. The shrinkage of slit size into deep subwavelength scale introduces many novel effects that cannot be described by classic interference theory. In this paper, the Young’s interference excited by subwavelength slits is investigated via rigorous Maxwell’s equations. We reveal a universal spin–orbit interaction mechanism associated with the catenary optical fields in 2D isotropic metal-dielectric structures for the generation of optical vortex array and spin Hall effect. Based on the interference of vectorial vortex arrays with opposite topological charges, a simple yet powerful method for the fabrication of space-variant metasurfaces is proposed for the first time, which breaks the fundamental limit of traditional interference lithography. These results may provide numerous new perspectives on both the design of catenary metasurfaces and optical spin-controlled devices.

中文翻译：

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异常杨氏干扰的再研究：从悬链光学场到超表面的自旋轨道相互作用

杨氏干涉是2004年在金属表面观察到的异常现象。狭缝尺寸缩小到亚波长以下会产生许多新颖的效应，这是经典干涉理论所无法描述的。本文通过严格的麦克斯韦方程研究了亚波长缝隙激发的杨氏干涉。我们揭示了与二维各向同性金属-介电结构中的悬链光学场相关的通用自旋-轨道相互作用机制，用于产生光学涡旋阵列和自旋霍尔效应。基于具有相反拓扑电荷的矢量涡旋阵列的干涉，首次提出了一种简单而强大的制造空间变异超表面的方法，这打破了传统干涉光刻的基本局限。