摘要
基于电磁光束角谱法和稳相法,推导出了两个刃型位错高斯光束的横电(TE)波和横磁(TM)波在远场传输和能流密度的解析表达式,研究了两个刃型位错高斯光束在远场中的位相奇点和能流密度分布。研究结果表明,当两刃型位错的离轴量为0时,电场分量在远场中出现两条刃型位错;而当两离轴量不为0时,刃型位错消失,存在光涡旋。刃型位错、光涡旋和能流密度均关于原点对称。随着离轴量的增大,光涡旋和能流密度黑核会向原点靠近并在原点处重合。
Based on the methods of vector angular spectrum and stationary phase, the analytical expressions of the transverse electric （TE） and transverse magnetic （TM） terms and energy flux distributions of two edge dislocations in Gaussian beams in the far field are derived and used to analyze the phase singularities and energy flux distributions. The result shows that two edge dislocations appear in the electric field component on condition that two off-axis distances are equal to zero. The edge dislocations will vanish and optical vortices may take place when two off-axis distances are nonzero. Edge dislocations and optical vortices and energy flux distributions are symmetric about the origin. With increasing the off-axis distances, optical vortices and black nuclei in the energy flux distributions move toward the origin and coincide at the origin.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2013年第11期247-253,共7页
Acta Optica Sinica
基金
四川省教育厅自然科学基金(10ZB029)
关键词
物理光学
奇点光学
刃型位错
角谱
位相奇点
能流密度分布
physical optics
singular optics
edge dislocation
angular spectrum
phase singularity
energy fluxdistribution
