A 32 μm large-size microparticle is trapped by an all-fiber hollow Bessel-like beam. In order to realize the proposed high-order Bessel-like beam, we fabricate the optical fiber probe by splicing an annular core fiber with a step-index multimode fiber. We grind the fiber tip into a truncated cone shape to converge the hollow Bessel-like beam to obtain a large focal area. Simulation and experimental results show that the trapping field introduced by the Bessel-like beam provides a relatively strong optical force and has the capability of 3-D capture of a large particle (whose diameter is 32 μm). These highly integrated fiber tweezers provide hollow Bessel-like beams with strong optical force and large trapping area, which can be promisingly applied in biomedical and integrated optical research.

中文翻译：

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全纤维空心贝塞尔式光束，用于大型颗粒捕集阱

全纤维空心贝塞尔状光束捕获了32μm的大尺寸微粒。为了实现拟议的高阶贝塞尔光束，我们通过将环形芯光纤与阶跃折射率多模光纤拼接在一起来制造光纤探头。我们将光纤尖端磨成截锥形，以会聚贝塞尔空心光束，从而获得较大的聚焦面积。仿真和实验结果表明，类贝塞尔光束引入的俘获场提供了相对较强的光学力，并具有3D捕获大颗粒（直径为32μm）的能力。这些高度集成的光纤镊子可提供具有强光学力和大捕获面积的空心贝塞尔光束，可有望应用于生物医学和集成光学研究。