Kozawa Yuichi, Sato Shunichi
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan.
J Opt Soc Am A Opt Image Sci Vis. 2012 Nov 1;29(11):2439-43. doi: 10.1364/JOSAA.29.002439.
We consider the formation of a small focal spot, which has been reported in [J. Opt. Soc. Am. A 24, 1793 (2007)], by separating a higher-order radially polarized Laguerre-Gaussian beam into two parts: a Bessel-like multi-ring part and an annular part. The latter forms a dominant small spot of longitudinal electric field component near the focus, while the former mainly contributes to a weak annular pattern of radial component.
我们通过将高阶径向偏振拉盖尔 - 高斯光束分离为两部分：类贝塞尔多环部分和环形部分，来考虑一个小焦斑的形成，这在[《美国光学学会志A》24, 1793 (2007)]中有报道。后者在焦点附近形成纵向电场分量的主导小光斑，而前者主要对径向分量的弱环形图案有贡献。
