摘要
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.
作者
凌林
郭红莲
黄璐
屈娥
李兆霖
李志远
LING Lin;GUO Hong-Lian;HUANG Lu;QU E;LI Zhao-Lin;LI Zhi-Yuan(Laboratory of Optical Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190;Yunnan Academy of Scientific&Technical Information,Kunming 650051)
基金
Supported by the National Natural Science Foundation of China under Grant No 11104342
the National Basic Research Foundation of China under Grant No 2011CB922002.