The Measurement of Displacement and Optical Force in Multi-Optical Tweezers

LING Lin; GUO Hong-Lian; HUANG Lu; QU E; LI Zhao-Lin; LI Zhi-Yuan

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The Measurement of Displacement and Optical Force in Multi-Optical Tweezers

机译：多光镊的位移和光学力的测量

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We set up a system of multiple optical tweezers based on a spatial light modulator, and measured the displacement and optical force of the trapped particles simultaneously. All of the trapped particles can be clearly imaged in three dimensions by several CCDs. The displacement is obtained by calculating the gray weighted centroid in the trapped particle's image. The stiffness of the trapped particles in the optical traps is measured by oscillating the sample stage in a triangular wave based on Stokes fluid dynamics. The optical force of each trapped particle can be calculated by the measured displacement and stiffness.%We set up a system of multiple optical tweezers based on a spatial light modulator,and measured the displacement and optical force of the trapped particles simultaneously.All of the trapped particles can be clearly imaged in three dimensions by several CCDs.The displacement is obtained by calculating the gray weighted centroid in the trapped particle's image.The stiffness of the trapped particles in the optical traps is measured by oscillating the sample stage in a triangular wave based on Stokes fluid dynamics.The optical force of each trapped particle can be calculated by the measured displacement and stiffness.

机译：我们建立了一个基于空间光调制器的多个光镊系统，并同时测量了被捕获粒子的位移和光学力。所有捕获的颗粒都可以通过多个CCD在三个维度上清晰地成像。通过计算捕获的粒子图像中的灰色加权质心来获得位移。根据斯托克斯流体动力学，通过使样品台在三角波中振荡来测量光阱中捕获的颗粒的刚度。可以通过测量位移和刚度来计算每个捕获粒子的光学力。％我们建立了一个基于空间光调制器的多个光镊系统，并同时测量了捕获粒子的位移和光学力。捕获的粒子可以通过多个CCD在三个维度上清晰地成像：通过计算捕获粒子图像中的灰色加权质心获得位移;通过在三角波中振荡样品台来测量捕获阱中捕获粒子的刚度可以根据测得的位移和刚度来计算每个捕获粒子的光学力。

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《中国物理快报：英文版》 |2012年第1期|160-163|共4页
作者
LING Lin; GUO Hong-Lian; HUANG Lu; QU E; LI Zhao-Lin; LI Zhi-Yuan;
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作者单位

Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190;

Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190;

Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190;

Yunnan Academy of Scientific & Technical Information, Kunming 650051;

Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190;

Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
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The Measurement of Displacement and Optical Force in Multi-Optical Tweezers

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