The focus of light -: theoretical calculation and experimental tomographic reconstruction
The focus of light -: theoretical calculation and experimental tomographic reconstruction
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DOI：
10.1007/s003400000451
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发表时间：
2001-01-01
影响因子：
2.1
通讯作者：
Leuchs, G
中科院分区：
文献类型：
--
作者：
Quabis, S;Dorn, R;Leuchs, G
本文对大数值孔径光学系统焦场分布进行了数值计算。推导了基于德拜近似的径向偏振入射光场的衍射积分，并对其进行了计算。结果表明，与线偏振的情况相比，这种模式聚焦到的光斑尺寸要小得多。提出了一种基于刀口法和层析重建的焦区三维光强分布测量实验装置。
We present numerical calculations on the field distribution in the focus of an optical system with high numerical aperture. The diffraction integrals which are based on the Debye approximation are derived and evaluated for a radially polarized input field with a doughnut-shaped intensity distribution. It is shown that this mode focusses down to a spot size significantly smaller as compared to the case of linear polarization. An experimental setup to measure the three-dimensional intensity distribution in the focal region is presented, which is based on the knife-edge method and on tomographic reconstruction.