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Trapping of low-refractive-index nanoparticles in a hollow dark spherical spot

机译:在中空暗球形斑点中捕获低折射率纳米粒子

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Optical trapping techniques have been of great interest and have advantages that enable the direct handling of nanoparticles. However, stable trapping of low-refractive-index nanoparticle remains challenging because the conventional two-dimensional hollow beams are only capable of trapping nanoparticle in the transverse plane. In this work, we propose a novel strategy to optically trap low refractive- index nanoparticle in three-dimensional space with a hollow dark spherical focal spot, which is generated by 4Pi focusing of radially polarized first-order Laguerre-Gaussian beam. With the assumption that the laser power is 100 mW, the nanoparticles can be stably trapped with the maximal optical force of 0.3 pN, potential depth of 10 K_BT and stiffness of 80 pN/μm. Moreover, both the number and the position of the focal spot can be controlled by modulating the focusing condition and the gradient phase of the illumination respectively, enabling the simultaneously trapping of multiple nanoparticles with complex motion trajectory. The technique demonstrated in this work may open up new avenues for optical manipulation and their applications in various scientific fields.
机译:光学捕获技术已经引起人们极大的兴趣,并且具有能够直接处理纳米颗粒的优点。然而,由于常规的二维中空束仅能够将纳米颗粒捕获在横向平面中,因此低折射率纳米颗粒的稳定捕获仍然具有挑战性。在这项工作中,我们提出了一种新颖的策略,以低密度的纳米粒子在具有空心暗球形焦点的三维空间中进行光学捕获,这是由径向偏振一阶Laguerre-Gaussian光束的4Pi聚焦产生的。假设激光功率为100 mW,则纳米粒子可以以0.3 pN的最大光学力,10 K_BT的势能深度和80 pN /μm的刚度稳定捕获。此外,可以分别通过调节照明的聚焦条件和梯度相位来控制焦点的数量和位置,从而能够同时捕获具有复杂运动轨迹的多个纳米粒子。这项工作中展示的技术可能会为光学操纵及其在各种科学领域中的应用开辟新的途径。

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