论文标题
在黑暗的焦点中光学诱捕
Optical Trapping in a Dark Focus
论文作者
论文摘要
高斯模式的叠加和具有$ \ ell = 0的Laguerre-gauss模式，P \ neq0 $生成所谓的瓶梁：一个被明亮区域包围的黑暗焦点。在本文中，我们从理论上探讨了瓶梁作为光学陷阱的使用，用于介电球，其折射率小于其周围介质。作用在小粒子上的力是在偶极子近似中得出的，用于模拟陷阱中粒子的布朗运动。通过数值研究了粒径的中间状态，发现较大的介电颗粒的稳定捕获也是可能的。根据中间状态分析的结果，提出了一个旨在将活生物体捕获在瓶束的黑暗焦点中的实验。
The superposition of a Gaussian mode and a Laguerre-Gauss mode with $\ell=0,p\neq0$ generates the so-called bottle beam: a dark focus surrounded by a bright region. In this paper, we theoretically explore the use of bottle beams as an optical trap for dielectric spheres with a refractive index smaller than that of their surrounding medium. The forces acting on a small particle are derived within the dipole approximation and used to simulate the Brownian motion of the particle in the trap. The intermediate regime of particle size is studied numerically and it is found that stable trapping of larger dielectric particles is also possible. Based on the results of the intermediate regime analysis, an experiment aimed at trapping living organisms in the dark focus of a bottle beam is proposed.
