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Axial irradiance distribution throughout the whole space behind an annular aperture

机译：环形孔后面整个空间的轴向辐照度分布

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摘要

In many photonics and fiber-optics applications, the irradiance distribution in the very near field (z/D<0.25) behind a circular or annular aperture is of interest. We present the results of detailed calculations of the irradiance distribution throughout the entire space behind an annular aperture. Included as a special case of the annular aperture is the circular aperture and the opaque circular disk. A log-log plot over many orders of magnitude in axial distance provides particular insight. The behavior throughout the Fresnel and Fraunhofer region is well known; however, we pay particular attention to the behavior in the near field. A variety of subtle effects in the near field are presented and discussed.
机译：在许多光子学和光纤应用中，圆形或环形孔后面的非常近场（z / D <0.25）中的辐照度分布是令人关注的。我们介绍了整个环形孔后面整个空间的辐照度分布的详细计算结果。作为环形孔的一种特殊情况，包括圆形孔和不透明的圆形盘。轴向距离上多个数量级的对数-对数图提供了特殊的见解。整个菲涅尔和弗劳恩霍夫地区的行为众所周知。但是，我们要特别注意近场的行为。提出并讨论了近场中的各种微妙影响。

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