论文标题
极化奇异性引起的小颗粒上的光学力和扭矩
Optical force and torque on small particles induced by polarization singularities
论文作者
论文摘要
近场的光学在小颗粒和分子的片上光学操作中具有重要的应用。在这里，我们报告了一项针对金缸光学极化奇异性引起的小颗粒的光学和扭矩的研究。我们表明，气缸的散射会在近场中产生电和磁性C线（即极化奇异线），并且C线可以在介电/磁性粒子上诱导复杂的力和扭矩。力和扭矩表现出具有有趣的对称特性的显着空间变化，为近场光学操纵提供了丰富的自由度。据我们所知，这项研究首次揭示了光学极化奇点对光诱导的力和扭矩对小颗粒的影响。结果有助于理解手性光 - 物质相互作用，并可以在片上光学操作和光学传感中找到应用。
Optical forces in the near fields have important applications in on-chip optical manipulations of small particles and molecules. Here, we report a study of optical force and torque on small particles induced by the optical polarization singularities of a gold cylinder. We show that the scattering of the cylinder generates both electric and magnetic C lines (i.e., lines of polarization singularities) in the near fields, and the C lines can induce complex force and torque on a dielectric/magnetic particle. The force and torque manifest dramatic spatial variations with interesting symmetry properties, providing rich degrees of freedom for near-field optical manipulations. The study, for the first time to our knowledge, uncovers the effect of optical polarization singularities on light-induced force and torque on small particles. The results contribute to the understanding of chiral light-matter interactions and can find applications in on-chip optical manipulations and optical sensing.
