Study on focusing mechanism of radial polarization with immersion objective
Study on focusing mechanism of radial polarization with immersion objective
复制标题
DOI：
10.1143/jjap.47.5806
复制
发表时间：
2008-07-01
影响因子：
1.5
通讯作者：
Tien, Chung-Hao
中科院分区：
文献类型：
--
作者：
Lan, Tzu-Hsiang;Tien, Chung-Hao
在这项研究中，我们使用具有线偏振和圆偏振照明的浸没物镜，采用矢量衍射来检查径向偏振光束的聚焦机制。径向偏振在高数值孔径（NA）系统中具有锐聚焦的特点。控制光斑形成的纵向分量取决于偏振矢量的弯曲，而不是浸没环境。当物镜的边缘角超过64.16度和71.81度时，径向偏振光束的去偏振效应分别使光斑比线偏振和圆偏振更小。
In this study, we employ vectorial diffraction to examine the focusing mechanism of radially polarized beams using an immersion objective with linear and circular polarized illuminations. Radial polarization features a sharp focus in a highnumerical-aperture (NA) system. The longitudinal component governing spot formation depends on the bending of the polarization vector rather than the immersion circumstance. As the marginal angle of the objective exceeds 64.16 and 71.81 degrees, the depolarization effect of the radially polarized beam enables a smaller spot than the linear and circular polarizations, respectively.