Integrating the optical tweezers and spanner onto an individual single-layer metasurface
Integrating the optical tweezers and spanner onto an individual single-layer metasurface
复制标题
将光镊和扳手集成到单个单层超表面上
DOI：
10.1364/prj.421121
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发表时间：
2021-06-01
影响因子：
7.6
通讯作者：
Zhu, Shining
中科院分区：
文献类型：
--
作者：
Li, Tianyue;Xu, Xiaohao;Zhu, Shining
光镊和光旋光镊是光学操纵的有力工具，它们分别负责粒子的捕获和旋转。传统上，OT和OS是使用庞大的三维设备，如显微镜物镜和空间光调制器。最近，提出了将它们建立在微尺度平台上的元表面，这极大地简化了系统。然而，用一个相同的元表面实现OT和OS是一个挑战。在这里，我们提供了一个基于元表面的解决方案，以集成OT和OS。使用基于几何和动态相位的流行方法，我们表明，它是可能的，以构建一个输出字段，这承诺一个高数值孔径的焦点，伴随着同轴涡。光学捕获和旋转的数值演示通过估计粒子探针上的机械效应。此外，我们展示了一个按需控制的OT-OS的距离和所拥有的OS的拓扑电荷。通过揭示OT-OS元表面，我们的研究结果可能会使先进的应用程序在芯片上的粒子操纵。(C)2021中国激光出版社
Optical tweezers (OTs) and optical spanners (OSs) are powerful tools of optical manipulation, which are responsible for particle trapping and rotation, respectively. Conventionally, the OT and OS are built using bulky three-dimensional devices, such as microscope objectives and spatial light modulators. Recently, metasurfaces are proposed for setting up them on a microscale platform, which greatly miniaturizes the systems. However, the realization of both OT and OS with one identical metasurface is posing a challenge. Here, we offer a metasurface-based solution to integrate the OT and OS. Using the prevailing approach based on geometric and dynamic phases, we show that it is possible to construct an output field, which promises a high-numerical-aperture focal spot, accompanied with a coaxial vortex. Optical trapping and rotation are numerically demonstrated by estimating the mechanical effects on a particle probe. Moreover, we demonstrate an on-demand control of the OT-to-OS distance and the topological charge possessed by the OS. By revealing the OT-OS metasurfaces, our results may empower advanced applications in on-chip particle manipulation. (C) 2021 Chinese Laser Press