部分相干圆偏振贝塞耳-高斯光束经高数值孔径透镜的聚焦  

Focusing of Partially Coherent and Circularly Polarized Bessel-Gaussian Beams Through a High Numerical-Aperture Objective

作　　者：陈宝算[1] 蒲继雄[1] 张志明[2] 王喜庆[2] 

机构地区：[1]华侨大学信息科学与工程学院,福建泉州362021 [2]西南交通大学理学院物理系,四川成都610031

出　　处：《光学学报》2009年第6期1664-1670,共7页Acta Optica Sinica

基　　金：福建省科技计划重点项目(2007H0027);福建省自然科学基金(A0810012)资助项目

摘　　要：研究了部分相干圆偏振贝塞耳-高斯光束经高数值孔径透镜的聚焦特性。基于德拜矢量积分理论,分别推导出了部分相干圆偏振涡旋光束经过商数值孔径透镜聚焦以后的光强和偏振度表达式。根据数值模拟的结果,比较了左旋和右旋圆偏振涡旋光束的不同深聚焦特性以及相关参量对涡旋光束深聚焦特性的影响。研究表明,入射光束的相关参数和聚焦透镜的数值孔径大小都会影响光束的聚焦特性。此外,还得出一个重要结论,部分相干圆偏振涡旋光束经高数值孔径透镜聚焦以后.光束本身带有的自旋角动量会转化成轨道角动量,这一研究成果对于利用涡旋光束进行微粒操控等方面应用具有十分重要的意义。The focusing properties of partially coherent and circularly polarized Bessel-Gaussian beams through a high numerical-aperture objective are studied. Based on vectorial Debye theory, expressions of intensity distribution and degree of polarization in the focal field are derived. Numerical calculations are performed to compare the different focusing properties of right-circular and left-circular polarized partially coherent Bessel-Gaussian beams. Furthermore, the influence of correlated parameters of the incident beam and the maximal angle of the high numerical-aperture objective are studied in great detail. It is found that the spin angular momentum of the beam will transfer into orbital angular momentum when the circularly polarized beam is focused by a high numerical-aperture objective. It is also found that the focusing properties will be influenced by the correlated parameters studied. The research of this paper is of great importance in the optical micromanipulation field.

关 键 词：物理光学 德拜矢量积分理论 高数值孔径 贝塞耳-高斯光束 偏振度 

分 类 号：O436[机械工程—光学工程]