Focusing Properties of Radially Polarized Beam with Radial Cosine Phase Wavefront
The focusing properties of radially polarized beam with radial cosine wavefront phase are investigated. For radially polarized beam without any wavefront phase, focus pattern is ring for low numerical aperture, while only one intensity peak for high numerical aperture due to stronger longitudinal field component in focal region. When the radially polarized beam with radial cosine wavefront phase is focused, focal pattern differs with frequency parameter in cosine function. For high numerical aperture, focal shift occurs, and focal patterns also evolve considerably, for instance, from only one peak to two or multiple peaks. Focal shift value fluctuates for low frequency parameter, drops sharply, and then comes back slightly. Simultaneously, Peak intensity ratio of radially polarized component to longitudinal polarized component in focal region decreases slowly, and then increases very quickly.
X.Gao J.Wang L.Sun S.Zhuang
Electronics and Information College,Hangzhou Dianzi University Hangzhou 310018,China;University of S Electronics and Information College,Hangzhou Dianzi University Hangzhou 310018,China Electronics and Information College,Hangzhou Dianzi University Hangzhou 310018,China;Key Laboratory University of Shanghai for Science and Technology,Shanghai 200093,China
国际会议
Progress in Electromagnetics Research Symposium 2009(2009年电磁学研究新进展学术研讨会)(PIERS 2009)
北京
英文
1036-1040
2009-03-23（万方平台首次上网日期，不代表论文的发表时间）