Traditionally, optical vortices (OVs) were generated with diffractive optical elements (DOEs) such as spiral phase plate (SPP), fork grating, spatial light modulator (SLM), and liquid crystal display (LCD). Here, a method was proposed for generating OVs by employing all-dielectric polarization-insensitive metasurfaces with cylinder arrays, which have high transmission efficiency. The polarization insensitivity of the metasurfaces was illustrated with the incidence of two pairs of orthogonal polarization, both the phase and transmission efficiency were consistent for the cylinder unit cell, and similar OVs were generated with the cylinder array. The topological charges of the generated OVs can be adjusted through the design of the metasurfaces. OVs with additional characteristics as vector beams, focused beams and Bessel beams were further generated. This work has potential applications in beam shaping, optical tweezers, and optical communication.

中文翻译：

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使用偏振不敏感超表面生成光学涡流

传统上，光学涡流 (OV) 是由衍射光学元件 (DOE) 产生的，例如螺旋相位板 (SPP)、叉形光栅、空间光调制器 (SLM) 和液晶显示器 (LCD)。在这里，提出了一种通过使用具有高传输效率的圆柱阵列的全介电极化不敏感超表面来产生 OV 的方法。超表面的偏振不敏感性用两对正交偏振的入射来说明，圆柱晶胞的相位和传输效率是一致的，并且圆柱阵列产生了类似的 OV。生成的 OV 的拓扑电荷可以通过超表面的设计进行调整。具有附加特征的 OV 作为矢量光束，进一步产生聚焦光束和贝塞尔光束。这项工作在光束整形、光镊和光通信方面具有潜在的应用。