Yew Elijah Y S, Sheppard Colin J R
Division of BioEngineering, National University of Singapore, Singapore.
Opt Lett. 2007 Dec 1;32(23):3417-9. doi: 10.1364/ol.32.003417.
We examine the effects of tightly focusing a radially polarized beam with uniform, Gaussian, or Bessel-Gauss pupil functions. The resulting FWHM is smallest for the case of a uniform amplitude profile, while the Bessel-Gauss beam results in the largest FWHM. The uniform amplitude profile also results in an axial field component that increases fastest with increasing NA. The ratio of the axial component to the transverse component is also the greatest for the uniform pupil function. On the other hand, the Bessel-Gauss beam benefits the most from the use of an annulus.
我们研究了使用均匀、高斯或贝塞尔 - 高斯光瞳函数对径向偏振光束进行紧聚焦的效果。对于均匀振幅分布的情况，所得的半高宽最小，而贝塞尔 - 高斯光束的半高宽最大。均匀振幅分布还会产生一个轴向场分量，该分量随数值孔径（NA）的增加而增加得最快。对于均匀光瞳函数，轴向分量与横向分量的比值也是最大的。另一方面，贝塞尔 - 高斯光束在使用环形光阑时受益最大。
