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Pulling cylindrical particles using a soft-nonparaxial tractor beam

机译:使用柔软的非傍轴牵引梁拉动圆柱形颗粒

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摘要

In order to pull objects towards the light source a single tractor beam inevitably needs to be strongly nonparaxial. This stringent requirement makes such a tractor beam somewhat hypothetical. Here we reveal that the cylindrical shape of dielectric particles can effectively mitigate the nonparaxiality requirements, reducing the incidence angle of the partial plane waves of the light beam down to 45 degrees and even to 30 degrees for respectively dipole and dipole-quadrupole objects. The optical pulling force attributed to the interaction of magnetic dipole and magnetic quadrupole moments of dielectric cylinders occurs due to the TE rather than TM polarization. Therefore, the polarization state of the incident beam can be utilized as an external control for switching between the pushing and pulling forces. The results have application values towards optical micromanipulation, transportation and sorting of targeted particles.
机译:为了将物体拉向光源,单个牵引光束不可避免地需要是强非傍轴的。这种严格的要求使得这种牵引梁有些假想。在这里,我们揭示了介电粒子的圆柱形状可以有效地缓解非傍轴性要求,从而将偶极子和偶极四极子分别将光束的部分平面波的入射角降低到45度甚至30度。归因于电介质圆柱体的磁偶极子和磁四极矩相互作用的光学拉力是由于TE而不是TM极化而产生的。因此,入射光束的偏振状态可以用作在推力和拉力之间切换的外部控制。该结果对目标粒子的光学显微操作,运输和分类具有应用价值。

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