光学
物理
光子学
衍射
电场
数值孔径
光子
角动量
焦点
光场
镜头(地质)
基点
量子力学
波长
作者
Jian Chen,Chenhao Wan,Ling Jiang Kong,Qiwen Zhan
出处
期刊:Optics Express
[The Optical Society]
日期:2017-08-03
卷期号:25 (16): 19517-19517
被引量:26
摘要
The spin angular momentum of photons offers a robust, scalable and high-bandwidth toolbox for many promising applications based upon spin-controlled manipulations of light. In this work, we develop a method to achieve controllable photonic spin orientation within a diffraction limited optical focal spot produced by a high numerical aperture objective lens. The required pupil field is found analytically through reversing the radiation patterns from two electric dipoles located at the focal point of the lens with orthogonal oscillation directions and quadrature phase. The calculated pupil fields are experimentally generated with a vectorial optical field generator. The produced photonic spin orientations are quantitatively evaluated by their spin densities according to the tightly focused electric fields calculated by Richard-Wolf vectorial diffraction theory to demonstrate the validity and capability of the proposed technique.
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