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首页> 外文期刊>Optics Letters >Demonstration of flat-top focusing under radial polarization illumination
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Demonstration of flat-top focusing under radial polarization illumination

机译:径向偏振照明下的平顶聚焦演示

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摘要

We experimentally demonstrate the generation of a flat-top intensity distribution using a radially polarized vector beam. Our approach uses higher numerical aperture focusing than what has been previously reported for a single, fixed, vector beam. In addition, the flat-top focus generated in our scheme exhibits a polarization gradient along the radial coordinate in the focal volume, with an on-axis longitudinal field component that persists over 2λ, which is a stark difference from conventional flat-top fields, which exhibit intensity profiles that are uniformly polarized. Our experimental results are found to be in good agreement with the theoretical prediction.
机译:我们实验证明了使用径向极化矢量束产生平顶强度分布。我们的方法使用的数值孔径聚焦要比以前针对单个固定矢量束的报道要高。此外,在我们的方案中生成的平顶焦点在焦距中沿径向坐标显示了一个极化梯度,其轴上纵向场分量持续超过2λ,这与常规的平顶场有明显的区别,表现出均匀极化的强度分布。我们的实验结果与理论预测吻合良好。

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