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.
© 2013 Optical Society of America
Original Manuscript: June 27, 2013
Revised Manuscript: August 20, 2013
Manuscript Accepted: August 21, 2013
Published: September 6, 2013
Xiangsheng Xie, Huayang Sun, Liangxin Yang, Sicong Wang, and Jianying Zhou, "Effect of polarization purity of cylindrical vector beam on tightly focused spot," J. Opt. Soc. Am. A 30, 1937-1940 (2013)