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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Optical Micro-Manipulation Using Laguerre-Gaussian Beams
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Optical Micro-Manipulation Using Laguerre-Gaussian Beams

机译：使用拉盖尔-高斯光束的光学微操纵

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摘要

In this work we investigate the features of single-ringed Laguerre-Gaussian (LG) beams, often referred to as optical vortices, for laser trapping and micro-manipulation experiments that can not be performed using Gaussian beams. LG beams, exhibiting "doughnut"-like transversal intensity distributions and carrying orbital angular momentum (OAM) about their axis, greatly extend the capabilities of laser tweezers. LG beams can be obtained by converting the Gaussian beam generated by a common laser source, by means of phase-only diffractive optical elements (DOEs). We present a trapping system based on DOEs implemented on a liquid crystal display. Trapping of small dielectric high-index particles on the "doughnut" profile is demonstrated. Orbital angular momentum transfer to trapped particles, which are caused to rotate, is studied as a function of the doughnut radius. Moreover, low-index particles, that would be rejected by a conventional Gaussian beam, are trapped in the zero intensity region of the doughnut. Finally, trapping of low-index particles with multi-LG beams, obtained by means of DOEs, is achieved.
机译：在这项工作中，我们调查了通常被称为光学涡旋的单环拉盖尔-高斯（LG）光束的特性，用于无法使用高斯光束进行的激光陷波和微操纵实验。 LG光束表现出类似“甜甜圈”的横向强度分布，并在其轴线周围带有轨道角动量（OAM），极大地扩展了激光镊子的功能。 LG光束可通过仅相位衍射光学元件（DOE）转换由普通​​激光源产生的高斯光束而获得。我们提出了一种基于在液晶显示器上实现的DOE的捕集系统。演示了在“甜甜圈”轮廓上捕获小的介电高折射率颗粒。研究了轨道角动量转移到被诱捕的被旋转粒子的过程，该运动是甜甜圈半径的函数。此外，将被常规高斯光束拒绝的低折射率颗粒被捕获在甜甜圈的零强度区域中。最终，实现了利用DOE捕获具有多LG光束的低折射率粒子。

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