Ultrasmall Optical Vortex Knots Generated by Spin‐Selective Metasurface Holograms,Advanced Optical Materials

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Ultrasmall Optical Vortex Knots Generated by Spin‐Selective Metasurface Holograms
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-02-28 , DOI: 10.1002/adom.201900263
Lei Wang ₁ , Weixuan Zhang ₁ , Hongxing Yin ₂ , Xiangdong Zhang _{1,

2}

Affiliation

Tying isolated vortex knots in complex optical fields has been recently realized using spatial light modulators (SLMs). These traditional devices suffer from low efficiency, narrow bandwidth, and they cannot be integrated to nanophotonic systems. Here, the design and realization of metasurface holograms (MHs) is reported to efficiently generate the optical vortex knots in a broad spectral region. In comparison with conventional optical devices, the thicknesses and pixels of MHs are both in subwavelength scale, and the size of created optical vortex knot can be six orders of magnitude smaller than those produced by SLMs. Such extremely little vortex knots may find widespread applications in templating knotted micro/nano‐structures in photosensitive materials and 3D optical trapping of cold atoms in complex topologies at microscale. In particular, it is found that the spatial position of the generated off‐axis optical vortex knot is able to be symmetrically reversed by just changing the helicity of the incident light. This spin‐selective vortex knot generator can be regarded as a new type of metasurface device for manipulating the topological structure of optical vortex lines, which has potential applications in the field of singular optics.

中文翻译：

自旋选择性超颖表面全息图产生的超小光学涡旋结。

最近，已经使用空间光调制器（SLM）实现了在复杂的光学场中捆绑孤立的涡旋结。这些传统设备效率低，带宽窄，无法集成到纳米光子系统中。在这里，据报道，超表面全息图（MHs）的设计和实现可在宽光谱范围内有效生成光学涡旋结。与常规光学器件相比，MH的厚度和像素均在亚波长范围内，并且所产生的光学涡旋结的尺寸可以比SLM产生的光学涡旋结小6个数量级。这种极小的涡旋结可能会广泛应用于光敏材料中打结的微/纳米结构的模板化，以及复杂尺度下冷原子的3D光学捕获。特别是，发现仅通过改变入射光的螺旋度就可以对称地反转所产生的离轴光学涡旋结的空间位置。这种自旋选择涡旋结发生器可被视为操纵光学涡旋线拓扑结构的新型超表面装置，在奇异光学领域具有潜在的应用。

更新日期：2019-02-28

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