Highly nonparaxial electromagnetic fields are increasingly met in modern nanophotonics. Their characterization is vital, but the traditional beam-field methods are not applicable. In this work we demonstrate a novel technique to measure the two-point electromagnetic spatial coherence of random beam fields based on scattering from dipolar nanoparticles. We consider both unpolarized and fully polarized beams. The resolution of the technique is limited by the size of the particles, and the results are shown to agree well with those obtained by a digital micromirror device. Nanoprobe detection of electromagnetic light fields is particularly relevant for near-field situations where polarization and coherence properties are of major importance.

中文翻译：

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用纳米散射体探测光束的电磁相干度

在现代纳米光子学中，越来越多的高度非傍轴电磁场得到满足。它们的表征至关重要，但是传统的束场方法不适用。在这项工作中，我们展示了一种基于偶极纳米粒子散射来测量随机束场的两点电磁空间相干性的新技术。我们考虑非偏振光束和全偏振光束。该技术的分辨率受到颗粒尺寸的限制，结果表明与数字微镜器件获得的结果吻合良好。电磁光场的纳米探针检测与极化和相干特性非常重要的近场情况特别相关。