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.

中文翻译：

---

将光镊和扳手集成到单个单层超表面上

光镊 (OT) 和光学扳手 (OS) 是强大的光学操纵工具，分别负责粒子捕获和旋转。传统上，OT 和 OS 是使用庞大的三维设备构建的，例如显微镜物镜和空间光调制器。最近，提出了超表面用于在微型平台上设置它们，这极大地使系统小型化。然而，用一个相同的超表面实现 OT 和 OS 是一个挑战。在这里，我们提供了一个基于超表面的解决方案来集成 OT 和操作系统。使用基于几何和动态相位的流行方法，我们表明可以构建一个输出场，该场保证高数值孔径焦斑，伴随着同轴涡流。通过估计对粒子探测器的机械效应，光学捕获和旋转在数值上得到了证明。此外，我们展示了对 OT 到 OS 距离和 OS 拥有的拓扑电荷的按需控制。通过揭示 OT-OS 超表面，我们的结果可能会为片上粒子操作中的高级应用提供支持。