Li Xingyi, Zhou Yuan, Ge Suyang, Wang Guoxi, Li Siqi, Liu Zilei, Li Xing, Zhao Wei, Yao Baoli, Zhang Wenfu
Opt Lett. 2022 Feb 15;47(4):977-980. doi: 10.1364/OL.450490.
Chip-scale optical tweezers, which are usually implemented in a planar format without using bulky diffractive optical elements, are recognized as a promising candidate to be integrated with a lab-on-a-chip system. However, traditional chip-scale optical tweezers are often static and allow for only one type of manipulation functionality since the geometrical parameters of the tweezers are fixed. Herein, we introduce a new, to the best of our knowledge, class of on-chip optical tweezers for diverse types of manipulation of micro-particles. Utilizing both the propagation phase and Pancharatnam-Berry phase, we experimentally demonstrate the spin-dependent trapping, moving, and circling of micro-particles with the transfer of optical gradient force and orbital angular momentum to particles. We further show that the spin angular momentum of the output beam provides an additional degree of freedom to control the spinning rotation of particles. This new type of optical tweezers paves the way for multifunctional and dynamical trapping and manipulation of particles with a lab-on-a-chip system.
芯片级光镊通常以平面形式实现，无需使用庞大的衍射光学元件，被认为是与芯片实验室系统集成的有前途的候选者。然而，传统的芯片级光镊通常是静态的，由于光镊的几何参数是固定的，所以只能实现一种类型的操纵功能。在此，据我们所知，我们引入了一类新型的片上光镊，用于对微粒子进行多种类型的操纵。利用传播相位和潘查拉特纳姆-贝里相位，我们通过将光学梯度力和轨道角动量传递给粒子，实验证明了微粒子的自旋相关捕获、移动和圆周运动。我们进一步表明，输出光束的自旋角动量为控制粒子的自旋旋转提供了额外的自由度。这种新型光镊为利用芯片实验室系统对粒子进行多功能和动态捕获及操纵铺平了道路。
