摘要
由于圆偏振涡旋光束可以表征为柱坐标的径向矢量光束和角向矢量光束的线性叠加,因而在研究其聚焦特性时,必须考虑具有拓扑核的径向矢量光束聚焦后有角向分量和角向矢量光束聚焦后有径向分量。在修正关于圆偏振涡旋光束强聚焦公式的基础上,重新模拟计算了不同拓扑核的圆偏振涡旋光束的强聚焦特性。结果显示不仅单自旋手性的圆偏振涡旋光束聚焦能形成平顶光束,而且两束不同的自旋手性的涡旋光束的叠加聚焦也可以实现平顶光束。通过调节光束的振幅、束腰半径以及遮挡通光孔径可以有效地改变平顶光束的半宽。
Because circularly polarized vortex beam can be characterized as the linear super position of radiallypolarized and azimuthally polarized components in the cylindrical coordinate, when study the focusing properties ofthe circularly polarized vortex beam, we must consider radially polarized vector beam with topological nuclei hasazimuthal component after focusing and azimuthally polarized vector beam has radial component after focusing. Basedon the corrected tightly focusing formula of the circularly polarized vortex beam, we afresh study the tightly focusingproperties of the circularly polarized vortex beams with different topological nuclei. The results show that not onlythe focusing of the single handedness of the circularly polarized vortex beam but also the focusing of superposition oftwo circularly polarized vortex beams can generate flattop beam. By choosing the proper amplitude ratio, waist radiusand the aperture blocking, the half-width of flattop beam can be changed effectively.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2014年第5期235-242,共8页
Acta Optica Sinica
基金
国家自然科学基金(61108010
11204170)
上海市自然科学基金(11ZR1412300)
关键词
物理光学
偏振
涡旋光束
平顶光束
physical optics
polarization
vortex beams
flattop beam
