The Effect of Spherical Aberration on the Spectral Stokes Singularities of Tightly Focused Partially Coherent Anomalous Hollow Beams
The spectral Stokes singularities of partially coherent radially polarized anomalous hollow beams focused by a high numerical aperture(NA)objective in the presence of spherical aberration is studied in detail by using the vector Debye formula.It is shown that there exist s12,s23,and s31 spectral Stokes singularities.The variation of the spherical aberration,truncation parameter and half angle of the aperture lens will result in the motion,pair creation and annihilation,and changes in the degree of polarization of s12,s23,and s31 spectral Stokes singularities,and the handedness reversal of s12 singularities(C-points).The creation and annihilation occur for a pair of s12 singularities with opposite topological charge but same handedness,and for a pair of oppositely charged s23 or s31 singularities,which is similar to the aberration-free case.The collision of an s12 singularity with an L-line(s3 = 0 contour)leads to a V-point,which is located at the intersection of contours of s12 = 0 and s23 = 0(or s31 = 0)and is unstable.A small perturbation leads to the handedness reversal and changes in the degree of polarization of the C-point.The results have been illustrated numerically and are compared with the results of previous work.
Yamei Luo Jinhong Li Bihua Tang
Department of Biomedical Engineering,Luzhou Medical College,Luzhou 646000,China Department of Physics,Taiyuan University of Science and Technology,Taiyuan 030024,China
国际会议
Progress in Electromagnetics Research Symposium 2011(2011年电磁学研究新进展学术研讨会)
苏州
英文
554-557
2011-09-01（万方平台首次上网日期，不代表论文的发表时间）