Chen Baosuan, Pu Jixiong
College of Information Science and Engineering, Huaqiao University, Quanzhou, Fujian 362021, China.
Appl Opt. 2009 Mar 1;48(7):1288-94. doi: 10.1364/ao.48.001288.
We study the focusing properties of elliptically polarized vortex beams. Based on vectorial Debye theory, some numerical calculations are given to illustrate the intensity and phase distribution properties of tightly focused vortex beams. It is found that the spin angular momentum of the elliptically polarized vortex beam will convert to orbital angular momentum by the focusing. The influence of corresponding parameters on focusing properties is also investigated in great detail. It is shown that elliptical light spots can be obtained in the focal plane. Moreover the elliptical spot may rotate and the spot shape may change with the change of certain parameters. These properties are quite important for application of this kind of elliptically polarized vortex beam.
我们研究椭圆偏振涡旋光束的聚焦特性。基于矢量德拜理论，进行了一些数值计算以说明紧聚焦涡旋光束的强度和相位分布特性。研究发现，椭圆偏振涡旋光束的自旋角动量在聚焦过程中会转换为轨道角动量。还详细研究了相应参数对聚焦特性的影响。结果表明，在焦平面上可以获得椭圆光斑。此外，椭圆光斑可能会旋转，光斑形状可能会随某些参数的变化而改变。这些特性对于这类椭圆偏振涡旋光束的应用非常重要。
