高数值孔径聚焦三维光链的研究

通过设计衍射光学元件对入射矢量光进行调制，在高数值孔径聚焦系统焦点附近产生沿光轴方向的三维多点光俘获结构——光链.并针对不同的入射矢量偏振、聚焦透镜的数值孔径以及衍射光学元件结构，对光链性能的影响分别进行了系统的分析，实现对该独特光俘获结构的可控性研究. 关键词： 衍射光学元件 矢量光 光镊

Study of 3D optical chain with highly focused vector beam

We present a design of diffractive optical element to produce 3D optical chain along optical axis near the focus of a high numerical aperture (NA) lens by spatially modulating the phase of incoming vector beam. This optical chain can trap multiple individual particles in three dimensions at different planes near the focus. For flexibly controlling this special optical trapping system, we systematically analize the factors affecting the characteristics of the optical chain, such as different incoming vector polarization of light, the NA of the lens, and the structure of the DOE.