摘要
运用电磁光束的角谱法和稳相法,推导出双曲余弦高斯(ChG)涡旋光束的TE波和TM波在自由空间远场传输和能流密度的解析表达式,用以研究了ChG涡旋光束在远场中的位相奇点和能流密度分布特性.结果表明,改变ChG涡旋光束中的离心参数或束腰宽度,位相奇点的密度、位置会发生变化.涡旋离轴量的变化会导致能流密度分布的不对称性.当离心参数增大时,原点周围黑核会向原点中心移动.
Based on the methods of vector angular spectrum of electromagnetic beams and stationary phase, the analytical expressions of TE and TM terms and energy flux distributions of cosh-Gaussian （ChG） vortex beams in the far field are derived, and used to study the phase singularities and energy flux distributions of the ChG vortex beams. It is shown that the density and position of optical vortices will vary by changing decentered parameter or waist width in the ChG vortex beams. The vortex off-axis distance leads to an asymmetric spatial distribution of energy flux. With gradually increasing vortex off-axis distance, dark spots around the origin will move toward the origin center.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第13期239-245,共7页
Acta Physica Sinica
基金
四川省教育厅自然科学基金(批准号:10ZB029)资助的课题~~
关键词
双曲余弦高斯涡旋光束
位相奇点
能流密度
cosh-Gaussian vortex beams, phase singularity, energy flux distribution
