Focusing of elliptically polarized Gaussian beams through an annular high numerical aperture  

作　　者：陈宝算 蒲继雄 

机构地区：[1]Department of Information Science & Engineering,Huaqiao University

出　　处：《Chinese Physics B》2010年第7期245-250,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 60977068);the Natural Science Foundation of Fujian Province,China (Grant No. A0810012)

摘　　要：Based on the vectorial Debye theory, the focusing properties of the Gaussian beam through an annular high numerical aperture are studied numerically, including the intensity, the phase and the orbital angular momentum properties. Then the influence of certain parameters on the focusing properties is also investigated. It is shown that sub-wavelength elliptical light spots can be obtained. And there exists a vortex in the longitudinal component of the focused field even though the incident beam is Gaussian beam, indicating that the spin angular momentum of the elliptically polarized Gaussian beam is converted into the orbital angular momentum by the focusing.Based on the vectorial Debye theory, the focusing properties of the Gaussian beam through an annular high numerical aperture are studied numerically, including the intensity, the phase and the orbital angular momentum properties. Then the influence of certain parameters on the focusing properties is also investigated. It is shown that sub-wavelength elliptical light spots can be obtained. And there exists a vortex in the longitudinal component of the focused field even though the incident beam is Gaussian beam, indicating that the spin angular momentum of the elliptically polarized Gaussian beam is converted into the orbital angular momentum by the focusing.

关 键 词：Debye theory high numerical aperture elliptically polarized FOCUSING 

分 类 号：O436[机械工程—光学工程]