Quantitative orbital angular momentum measurement of perfect vortex beams
Quantitative orbital angular momentum measurement of perfect vortex beams
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DOI：
10.1364/ol.44.002736
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发表时间：
2019-02
期刊：
影响因子：
3.6
通讯作者：
J. Pinnell;V. Rodríguez-Fajardo;A. Forbes
中科院分区：
文献类型：
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作者：
J. Pinnell;V. Rodríguez-Fajardo;A. Forbes
完美（光学）涡旋（PV）具有将轨道角动量（OAM）编码到定义明确的环形环内的场上的能力。虽然这使得近场径向分布独立于OAM，但是远场径向分布仍然与OAM成比例，形成贝塞尔结构。到目前为止，PV的OAM的定量测量一直是难以捉摸的，当前的检测方案选择使用干扰或模式分类器的更多定性程序。在这里，我们表明，OAM内容的PV可以定量测量使用光学模态分解：一个已经广泛使用的技术分解成一组基函数的任意光场。我们概述了理论，并确认它通过实验写入空间光调制器的全息图，突出的OAM内容的准确分解所需的照顾。我们的工作将是感兴趣的大社区谁寻求使用这种结构光领域的各种应用，包括光学捕获和镊子，光通信。
Perfect (optical) vortices (PVs) have the mooted ability to encode orbital angular momentum (OAM) onto the field within a well-defined annular ring. Although this makes the near-field radial profile independent of OAM, the far-field radial profile nevertheless scales with OAM, forming a Bessel structure. As yet, the quantitative measurement of the OAM of PVs has been elusive, with current detection protocols opting for more qualitative procedures using interference or mode sorters. Here, we show that the OAM content of a PV can be measured quantitatively using optical modal decomposition: an already widely utilized technique for decomposing an arbitrary light field into a set of basis functions. We outline the theory and confirm it by experiment with holograms written to spatial light modulators, highlighting the care required for accurate decomposition of the OAM content. Our work will be of interest to the large community who seek to use such structured light fields in various applications, including optical trapping and tweezing, and optical communications.