中国物理B ›› 2013, Vol. 22 ›› Issue (6): 64202-064202.doi: 10.1088/1674-1056/22/6/064202
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
杜富荣a, 周哲海a, 谭峭峰b, 杨昌喜b, 张晓青a, 祝连庆a
Du Fu-Rong (杜富荣)a, Zhou Zhe-Hai (周哲海)a, Tan Qiao-Feng (谭峭峰)b, Yang Chang-Xi (杨昌喜)b, Zhang Xiao-Qing (张晓青)a, Zhu Lian-Qing (祝连庆)a
摘要: The theoretical and experimental results of tightly focused radially polarized vortex beams are demonstrated. An auto-focus technology is introduced into the measurement system in order to enhance the measurement precision, and the radially polarized vortex beams are generated by a liquid-crystal polarization converter and a vortex phase plate. The focused fields of radially polarized vortex beams with different topological charges at numerical apertures (NAs) of 0.65 and 0.85 are measured respectively, and the results indicate that the total intensity distribution at focus is dependent not only on the NA of the focusing objective lens and polarization pattern of the beam but also on the topological charge l of the beam. Some unique focusing properties of radially polarized vortex beams with fractional topological charges are presented based on numerical calculations. The experimental verification paves the way for some practical applications of radially polarized vortex beams, such as in optical trapping, near-field microscopy, and material processing.
中图分类号: (Polarization)