物理学报Issue(21)：118-124,7.DOI:10.7498/aps.63.214202
离轴高斯涡旋光束的深聚焦特性
Tight fo cusing prop erties of off-center Gaussian vortex b eams
摘要
Abstract
The properties of off-center Gaussian vortex beams focused by a high numerical aperture are investigated on the basis of vector Debye integral. A complex amplitude of off-center Gaussian vortex beams through a high numerical aperture objective is derived and numerical calculation is performed to analyze the intensity and phase distributions of the beams in the focal plane. It is shown that the intensity and phase distributions change significantly with the variation of off-axial distance; the intensity distribution in the focal plane is different in the direction of y-axis which is enhanced with the increase of off-axial distances; the sign of off-axial distance determines the direction in which the intensity is concentrated. On the other hand, different from the 1st order off-axial vortex beam, high-order off-axial vortex will split in the tightly focused field. Multiple phase singularities will appear and the number of singularities is equal to the topological charge of the original beam. Besides, the split singularities are symmetric, obviously. It is found that the splitting of high-order vortex is due to the tight focusing.关键词
深聚焦/暗核分裂/德拜矢量积分/离轴高斯涡旋光束Key words
tight focusing/split of singularity/vector Debye integral/off-center Gaussian vortex beams引用本文复制引用
王慧,丁攀峰,蒲继雄..离轴高斯涡旋光束的深聚焦特性[J].物理学报,2014,(21):118-124,7.基金项目
国家自然科学基金(批准号:61307001,61178015)和福建省自然科学基金(批准号:2013J05094)资助的课题.* Project supported by the National Natural Science Foundations of China (Grant Nos.61307001,61178015), and the Natural Science Foundation of Fujian Province, China (Grant No.2013J05094) （批准号:61307001,61178015）
