Focusing of high numerical aperture cylindrical-vector beams
Focusing of high numerical aperture cylindrical-vector beams
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DOI：
10.1364/oe.7.000077
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发表时间：
2000-07-17
期刊：
影响因子：
3.8
通讯作者：
Brown, TG
中科院分区：
文献类型：
--
作者：
Youngworth, KS;Brown, TG
近年来，圆柱矢量光束因其在新型激光谐振器中的作用以及在电子加速和扫描显微镜中的应用而受到越来越多的关注。本文计算了平面镜焦点区域附近的圆柱矢量场，并简要讨论了一些应用。我们表明，在紧密聚焦的径向偏振光束的特殊情况下，偏振在焦点区域显示出很大的不均匀性，而方向偏振光束即使在非常高的数值孔径下也是纯横向的。(C) 2000美国光学学会。
Cylindrical-vector beams are of increasing recent interest for their role in novel laser resonators and their applications to electron acceleration and scanning microscopy. In this paper, we calculate cylindrical-vector fields, near the focal region of an aplanatic lens, and briefly discuss some applications. We show that, in the particular case of a tightly focused, radially polarized beam, the polarization shows large inhomogeneities in the focal region, while the azimuthally polarized beam is purely transverse even at very high numerical apertures. (C) 2000 Optical Society of America.