As the size of research objects reaches the nanometer level, there is an increasing desire to trap and detect nanoparticles. However, the means to trap and study individual nanoparticles is not mature. Here, we propose and demonstrate a method for trapping a single nanoparticle stably and moving it in a three-dimensional space using a single-mode optical fiber probe based on a strong convergent LP${}_{11}$ mode beam. The small mode field diameter of the LP${}_{11}$ beam and the particular probe structure are combined to obtain a nanoscale convergence area to trap a 100 nm nanoparticle stably. The proposed optical fiber tweezers have the advantages of high spatial resolution, simple structure, and easy operation. They are expected to be developed to control organelles in single cells, screen particles of different sizes, and extract virus cells.

随着研究对象的尺寸达到纳米级，捕获和检测纳米粒子的愿望越来越强烈。然而，捕获和研究单个纳米粒子的手段并不成熟。在这里，我们提出并演示了一种使用基于强会聚 LP 的单模光纤探针稳定捕获单​​个纳米颗粒并将其在三维空间中移动的方法${}_{11}$模式光束。LP的小模场直径${}_{11}$光束和特定的探针结构相结合，获得纳米级会聚区域，稳定捕获 100 nm 纳米粒子。所提出的光纤镊子具有空间分辨率高、结构简单、操作方便等优点。预计它们将被开发用于控制单个细胞中的细胞器、筛选不同大小的颗粒以及提取病毒细胞。