Sharper focus for a radially polarized light beam
Sharper focus for a radially polarized light beam
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DOI：
10.1103/physrevlett.91.233901
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发表时间：
2003-12-05
影响因子：
8.6
通讯作者：
Leuchs, G
中科院分区：
文献类型：
--
作者：
Dorn, R;Quabis, S;Leuchs, G
我们首次通过实验证明，径向偏振场可以聚焦到比线偏振（0.26 λ（2））小得多的光斑尺寸[0.16（1）λ（2）]。光的矢量特性的效果示出的径向和方位角偏振输入字段的焦点强度分布的比较。对于强聚焦，径向偏振场导致焦点处的纵向电场分量，其是尖锐的并且以光轴为中心。通过使用环形孔来增强该分量的相对贡献。
We experimentally demonstrate for the first time that a radially polarized field can be focused to a spot size significantly smaller [0.16(1)lambda(2)] than for linear polarization (0.26lambda(2)). The effect of the vector properties of light is shown by a comparison of the focal intensity distribution for radially and azimuthally polarized input fields. For strong focusing, a radially polarized field leads to a longitudinal electric field component at the focus which is sharp and centered at the optical axis. The relative contribution of this component is enhanced by using an annular aperture.