高斯涡旋光束在自由空间传输中电场和磁场的偏振奇点  

The electric and magnetic polarization singularities of Gaussian vortex beam in the free-space propagation

作　　者：罗亚梅[1] 吕百达[2] 唐碧华[1] 朱渊[1] 

机构地区：[1]泸州医学院生物医学工程系,泸州646000 [2]四川大学激光物理与化学研究所,成都610064

出　　处：《物理学报》2012年第13期161-166,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10874125);四川省教育厅自然科学基金(批准号:10ZB029)资助的课题~~

摘　　要：利用矢量菲涅尔衍射积分公式,以高斯涡旋光束为例,推导出傍轴高斯涡旋光束在自由空间传输过程中电场分量和磁场分量的解析表达式,详细研究了自由空间中电场和磁场的偏振奇点变化规律.结果表明,高斯涡旋光束在自由空间传输中,存在二维和三维电场和磁场的偏振奇点,其位置一般不重合.改变光束束腰宽度比、振幅比以及传输距离,偏振奇点出现移动.在二维电场和磁场中,当满足一定条件时,会有V点产生.Using the Fresnel vector diffraction integral and taking the Gaussian vortex beam as an example, the analytical expressions for the electric and magnetic components of Gaussian vortex beam propagating in the free-space are derived, and used to study the variations of electric and magnetic polarization singularities in free space. It is found that there exist two-dimensional （2D） and three-dimensional （3D） electric and magnetic polarization singularities in the free-space, which do not coincide in general. By varying waist width ratio, amplitude ratio, and propagation distance, the motion of polarization singularities takes place. In the 2D and the 3D electric and magnetic fields, the V-point may appear under a certain condition.

关 键 词：高斯涡旋光束 电场和磁场的偏振奇点 自由空间传输 

分 类 号：O436[机械工程—光学工程]