Singh Rakesh Kumar, Senthilkumaran P, Singh Kehar
Department of Physics, Indian Institute of Technology, Delhi, New Delhi, India.
J Opt Soc Am A Opt Image Sci Vis. 2009 Mar;26(3):576-88. doi: 10.1364/josaa.26.000576.
The tight focusing of vortex carrying beams is studied using the Debye-Wolf diffraction integral in the presence of primary astigmatism. The roles of topological charge, polarization distribution of the input beam, and handedness of the beam polarization are investigated in the intensity distribution of the focal plane of a high-numerical-aperture lens. The effect of tight focusing in the presence of astigmatism on the dark core of the azimuthally polarized beam is also investigated and compared with the dark core of a circularly polarized vortex beam. The effect of an aberration has been discussed in the context of the fluorescent spot size in the focal plane of a stimulated emission depletion microscope for two different polarization setups.
利用德拜 - 沃尔夫衍射积分研究了存在初级像散时携带涡旋光束的紧聚焦。研究了拓扑电荷、输入光束的偏振分布以及光束偏振的旋向在高数值孔径透镜焦平面强度分布中的作用。还研究了存在像散时的紧聚焦对方位偏振光束暗核的影响，并与圆偏振涡旋光束的暗核进行了比较。针对两种不同的偏振设置，在受激辐射损耗显微镜焦平面荧光光斑尺寸的背景下讨论了像差的影响。
