Trapping volume control in optical tweezers using cylindrical vector beams
Trapping volume control in optical tweezers using cylindrical vector beams
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DOI：
10.1364/ol.38.000028
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发表时间：
2013-01-01
期刊：
影响因子：
3.6
通讯作者：
Jones, P. H.
中科院分区：
文献类型：
--
作者：
Skelton, S. E.;Sergides, M.;Jones, P. H.
我们提出了一个调查的结果，球形微粒的光学捕获使用激光束的空间不均匀的偏振方向[圆柱矢量光束（CVB）]。我们进行三维跟踪的布朗波动的位置被困粒子和提取陷阱弹簧常数。我们的陷阱的几何形状的特征在于在横向和平行于光束传播方向的方向上的弹簧常数的纵横比，并评估作为偏振角的函数的品质因数。我们表明，额外的自由度存在于CVB允许我们控制光阱的强度和几何形状，通过调整只有偏振的捕获光束。实验结果进行了比较与理论模型的光捕获使用CVB来自电磁散射理论中的T矩阵框架。(C)2012美国光学学会
We present the result of an investigation into the optical trapping of spherical microparticles using laser beams with a spatially inhomogeneous polarization direction [cylindrical vector beams (CVBs)]. We perform three-dimensional tracking of the Brownian fluctuations in the position of a trapped particle and extract the trap spring constants. We characterize the trap geometry by the aspect ratio of spring constants in the directions transverse and parallel to the beam propagation direction and evaluate this figure of merit as a function of polarization angle. We show that the additional degree of freedom present in CVBs allows us to control the optical trap strength and geometry by adjusting only the polarization of the trapping beam. Experimental results are compared with a theoretical model of optical trapping using CVBs derived from electromagnetic scattering theory in the T-matrix framework. (C) 2012 Optical Society of America