The focus of light—linear polarization breaks the rotational symmetry of the focal spot
The focus of light—linear polarization breaks the rotational symmetry of the focal spot
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DOI：
10.1080/09500340308235246
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发表时间：
2003-04
影响因子：
1.3
通讯作者：
R. Dorn;S. Quabis;G. Leuchs
中科院分区：
文献类型：
--
作者：
R. Dorn;S. Quabis;G. Leuchs
摘要我们首次从实验上证明了线偏振光束在高数值孔径聚焦系统中被聚焦成非对称光斑。这种不对称性是由理查兹和沃尔夫在1959年预测的，并且只有当偏振不敏感传感器放置在焦点区域时才能测量。我们在刀口型设置中使用了经过特殊修改的光电二极管，以获得焦点处总电能密度分布的高分辨率图像。结果与矢量聚焦理论的预测吻合得很好。
Abstract We experimentally demonstrate for the first time that a linearly polarized beam is focused to an asymmetric spot when using a high-numerical aperture focusing system. This asymmetry was predicted by Richards and Wolf in 1959 and can only be measured when a polarization-insensitive sensor is placed in the focal region. We used a specially modified photodiode in a knife-edge-type set-up to obtain highly resolved images of the total electric energy density distribution at the focus. The results are in good agreement with the predictions of a vectorial focusing theory.