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Optical trapping of nanowires

机译:纳米线的光阱

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摘要

The ability to hold and manipulate nanowires using optical beams opens up a range of applications from force sensing to directed assembly. For this reason, optical trapping of nanowires has received much recent interest. In the following article we present a detailed computational investigation of the stability and general behaviour of these systems. It is found that relatively high index wires can be trapped. Furthermore, the properties of the trap vary with the parameters of the nanowire in characteristic ways. For example, the trap stiffness in the direction parallel to the axes of the beam and the wire falls off with increasing length, and can be made arbitrarily small. At the same time the other translational stiffness coefficients attain a limit in which the stiffness perpendicular to the polarization direction is approximately one half of that in the parallel direction. Rotational stiffness coefficients are seen, conversely, to increase steadily with length. These observations are explained in terms of a simple analytical model that supports the numerical calculations.
机译:使用光束保持和操纵纳米线的能力开辟了从力感测到定向装配的一系列应用。由于这个原因,纳米线的光学俘获已经引起了很多关注。在下面的文章中,我们将对这些系统的稳定性和一般行为进行详细的计算研究。发现可以捕获相对较高的索引线。此外,陷阱的特性以特征性方式随纳米线的参数而变化。例如,在平行于束和线的轴线的方向上的阱刚度随着长度的增加而降低,并且可以任意地减小。同时,其他平移刚度系数达到极限,其中垂直于极化方向的刚度大约是平行方向上的刚度的一半。相反,旋转刚度系数随着长度的增加而稳定增加。这些观察结果是通过支持数值计算的简单分析模型进行解释的。

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