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arXiv 2007.14173physics.optics
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沿任意轨迹的广义理想光学涡旋

Generalized Perfect Optical Vortex along Arbitrary Trajectories

Yue Chen, Tingchang Wang, Yuxuan Ren, Zhaoxiang Fang, Guangrui Ding, Liqun He, Rongde Lu, Kun Huang

摘要:

理想光学涡旋光束是一种具有固定半径且与其拓扑荷无关的无限长薄环的涡旋光束。本文提出了在圆和椭圆的规则形状之外的任意曲线上的广义理想光学涡旋的概念。广义理想光学涡旋也具有与POVs相似的性质,例如仅沿无限细曲线定义,并且具有与尺度无关的拓扑荷。值得注意的是,它们分别沿着圆和椭圆自然退化为POV和椭圆POV。我们还通过数字微镜器件(DMD)实验产生了广义理想光涡旋,并通过干涉测量了其相位分布,与模拟结果吻合较好。此外,我们推导出一个适当的修正公式,以产生沿预定曲线具有均匀强度分布的广义完美光学涡旋。广义理想光涡旋在光镊和通信等领域有着潜在的应用前景。

英文摘要:

Perfect optical vortex (POV) is a type of vortex beam with an infinite thin ring and a fixed radius independent of its topological charge. Here we propose the concept of generalized perfect optical vortex along arbitrary curves beyond the regular shapes of circle and ellipse. Generalized perfect optical vortices also share the similar properties as POVs, such as defined only along infinite thin curves and owning topological charges independent of scales. Notably, they naturally degenerate to the POVs and elliptic POVs along circles and ellipses, respectively. We also experimentally generated the generalized perfect optical vortices through a digital micromirror device (DMD) and measured the phase distributions by interferometry, exhibiting good agreements with the simulations. Moreover, we derive a proper modified formula to yield the generalized perfect optical vortices with uniform intensity distribution along predesigned curves. The generalized perfect optical vortices might find the potential applications in optical tweezers and communication.

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