轴向光学捕获与涡旋光束：多极分解的作用
摘要
光学捕获是一种已知数十年的技术，具有多个领域的应用。最常见的情形是处理倾向于位于光捕获最亮部分的粒子。因此，光力会将粒子保持在光束的暗区 away。然而，当聚焦的圆环形光束产生轴向捕获时，情况并非如此。在该系统中，粒子位于激光束强度最低点上，亮的圆环部分位于粒子周围。研究人员对这一现象表现出浓厚兴趣，因为它优势在于减少光与被捕粒子之间的相互作用以及捕获力度的令人惊讶的增加。本文提出了针对轴向涡旋光束捕获的实验和理论结果的扩展分析。 Specifically, in our experiments, we trap micron-sized spherical silica (SiO2) particles in water and we measure, through the power spectrum density method, the trap stiffness constant \kappa generated by vortex beams with different topological charge orders. The optical forces are calculated from the exact solutions of the electromagnetic fields provided by the generalized Lorentz_Mie theory. We show a remarkable agreement between the theoretical prediction and the experimental measurements of \kappa. Moreover, our numerical model gives us information about the electromagnetic fields inside the particle, offering valuable insights into the influence of the electromagnetic fields present in the vortex beam trapping scenario.
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引用
@article{arxiv.2601.18915,
title = {On-Axis Optical Trapping with Vortex Beams: The Role of the Multipolar Decomposition},
author = {Iker Gómez-Viloria and Álvaro Nodar and Martín Molezuelas-Ferreras and Jorge Olmos-Trigo and Ángel Cifuentes and Miriam Martínez and Miguel Varga and Gabriel Molina-Terriza},
journal= {arXiv preprint arXiv:2601.18915},
year = {2026}
}