Gouy phase shift of a tightly focused, radially polarized beam
Gouy phase shift of a tightly focused, radially polarized beam
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DOI：
10.1364/optica.3.000035
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发表时间：
2016-01-20
期刊：
影响因子：
10.4
通讯作者：
Fischer, Bernd M.
中科院分区：
文献类型：
--
作者：
Kaltenecker, Korbinian J.;Koenig-Otto, Jacob C.;Fischer, Bernd M.
径向偏振光束是矢量光束家族的重要成员，特别是由于使用它们可以创建强而紧密聚焦的纵向场，这是一种基本特性，已被从显微镜到粒子加速等应用所利用。由于这种聚焦光束的性质与盖伊相移密切相关，因此对其行为的适当了解至关重要。太赫兹显微成像用于提取紧密聚焦径向偏振光的横向和纵向场分量的古伊相移。由于应用太赫兹时域方法能够映射电磁波在空间中的振幅和相位，我们能够直接追踪波通过焦点传播时几何相位的演变。我们观察到横向分量为2p相移，纵向分量为p相移。我们的实验程序是通用的，可以应用于确定其他矢量光束的几何相位，如光漩涡，甚至任意形状和偏振传播波。(C) 2016年美国光学学会
Radially polarized beams represent an important member of the family of vector beams, in particular due to the possibility of using them to create strong and tightly focused longitudinal fields, a fundamental property that has been exploited by applications ranging from microscopy to particle acceleration. Since the properties of such a focused beam are intimately related to the Gouy phase shift, proper knowledge of its behavior is crucial. Terahertz microscopic imaging is used to extract the Gouy phase shift of the transverse and longitudinal field components of a tightly focused, radially polarized beam. Since the applied terahertz time-domain approach is capable of mapping the amplitude and phase of an electromagnetic wave in space, we are able to directly trace the evolution of the geometric phase as the wave propagates through the focus. We observe a Gouy phase shift of 2p for the transverse and of p for the longitudinal component. Our experimental procedure is universal and may be applied to determine the geometric phase of other vector beams, such as optical vortices, or even arbitrarily shaped and polarized propagating waves. (C) 2016 Optical Society of America