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首页> 外文会议>Conference on Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues II; 20040127-20040128; San Jose,CA; US >Array of optical tweezers with individual beam-steering and polarization control
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Array of optical tweezers with individual beam-steering and polarization control

机译：带有独立光束控制和偏振控制的光镊阵列

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摘要

We report a new method for generating multiple optical tweezers that enables beam-steering functionality and polarization state control for each trapping beam. The method employs a spatial light modulator (SLM) that imparts a two-dimensional (2-D) phase distribution onto a linearly polarized input beam from a CW-laser (λ = 830 nm). A microlens array is used to divide the beam resulting in a matrix of point sources that are subsequently imaged onto the sample plane of a microscope as trapping beams. For beam steering, the plane of polarization of the input field is aligned parallel to the slow axis of the SLM, on which an array of phase grating patterns is encoded. The blazed grating parameters dictate the positional deflections of the optical traps. When the input polarization plane makes a 45°-angle with the SLM slow axis, an elliptic polarization state is produced for each optical trap and the degree of ellipticity depends on the phase difference introduced between the extraordinary and ordinary output field components at each SLM sub-aperture. It is known that elliptically polarized light changes its angular momentum when focused to a birefringent particle thereby inducing an axial rotation of the trapped object. We experimentally demonstrate the two modes of operation: (1) controlled lateral deflection of simultaneous trapped polystyrene microspheres and (2) polarization-induced rotation of simultaneously trapped calcite crystals.
机译：我们报告了一种生成多个光镊的新方法，该方法可以对每个捕获光束启用光束控制功能和偏振状态控制。该方法采用空间光调制器（SLM），该空间光调制器将二维（2-D）相分布赋予来自CW激光（λ= 830 nm）的线性偏振输入光束。使用微透镜阵列将光束分开，形成点源矩阵，然后将点源矩阵成像为显微镜的样品平面上的捕获束。对于光束转向，将输入场的偏振面与SLM的慢轴平行对齐，并在其上编码相控阵图形阵列。闪耀的光栅参数决定了光阱的位置偏移。当输入偏振面与SLM慢轴成45°角时，将为每个光阱产生一个椭圆偏振状态，椭圆度取决于每个SLM子处非常规和普通输出场分量之间引入的相位差。 -光圈。众所周知，椭圆偏振光在聚焦到双折射粒子上时会改变其角动量，从而引起被捕获物体的轴向旋转。我们通过实验证明了两种操作模式：（1）同时捕获的聚苯乙烯微球的横向偏斜控制和（2）同时捕获的方解石晶体的极化诱导旋转。

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