Xie Xiangsheng, Sun Huayang, Yang Liangxin, Wang Sicong, Zhou Jianying
J Opt Soc Am A Opt Image Sci Vis. 2013 Oct 1;30(10):1937-40. doi: 10.1364/JOSAA.30.001937.
The tightly focused spots of cylindrical vectors (CVs) are dependent on polarization composition. We experimentally demonstrate the effect of polarization purity (PP) of the CV beam on the tightly focused spot quantitatively, which should be strictly controlled for the effective applications of the CV beam. The focal spots measured by a knife-edge scanning method showed that the azimuthally polarized (AP) component increases the transverse field and the size of the focal spots, while the radially polarized component results in a nonzero intensity distribution at the center of the focus even in a high PP AP beam.
柱面矢量（CVs）的紧聚焦光斑取决于偏振组成。我们通过实验定量地证明了CV光束的偏振纯度（PP）对紧聚焦光斑的影响，对于CV光束的有效应用，应严格控制该影响。用刀口扫描法测量的焦斑表明，方位角偏振（AP）分量增加了横向场和焦斑尺寸，而径向偏振分量即使在高PP的AP光束中也会在焦点中心产生非零强度分布。
