论文标题
微球运动学来自紧密聚焦的不可分割的光的极化
Microsphere kinematics from the polarization of tightly focused nonseparable light
论文作者
论文摘要
最近，已经表明，可以通过测量其全局极化状态[Optica 2（10），864（2015）]来将矢量束用于快速运动传感。该方法依赖于由其不可分割的模式结构导致的照明场的空间和极化程度之间的相关性。在这里，我们将方法扩展到了非参与制度。我们从实验和理论上研究通过在紧密聚焦的矢量梁中散射介电微球而产生的远场极化状态，这是粒子位置的函数。仅使用极化测量值，我们证明了在三个维度上对MIE粒子的位置传感。我们的工作扩展了后焦平面干涉法的概念，并突出了使用结构化光的光学镊子中极化分析的潜力。
Recently, it was shown that vector beams can be utilized for fast kinematic sensing via measurements of their global polarization state [Optica 2(10), 864 (2015)]. The method relies on correlations between the spatial and polarization degrees of freedom of the illuminating field which result from its nonseparable mode structure. Here, we extend the method to the nonparaxial regime. We study experimentally and theoretically the far-field polarization state generated by the scattering of a dielectric microsphere in a tightly focused vector beam as a function of the particle position. Using polarization measurements only, we demonstrate position sensing of a Mie particle in three dimensions. Our work extends the concept of back focal plane interferometry and highlights the potential of polarization analysis in optical tweezers employing structured light.
