The Measurement of Displacement and Optical Force in Multi-Optical Tweezers
LING Lin1, GUO Hong-Lian1**, HUANG Lu1, QU E2, LI Zhao-Lin1, LI Zhi-Yuan1
1Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 2Yunnan Academy of Scientific & Technical Information, Kunming 650051
The Measurement of Displacement and Optical Force in Multi-Optical Tweezers
LING Lin1, GUO Hong-Lian1**, HUANG Lu1, QU E2, LI Zhao-Lin1, LI Zhi-Yuan1
1Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 2Yunnan Academy of Scientific & Technical Information, Kunming 650051
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.
Abstract：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.
LING Lin;GUO Hong-Lian**;HUANG Lu;QU E;LI Zhao-Lin;LI Zhi-Yuan. The Measurement of Displacement and Optical Force in Multi-Optical Tweezers[J]. 中国物理快报, 2012, 29(1): 14214-014214.
LING Lin, GUO Hong-Lian**, HUANG Lu, QU E, LI Zhao-Lin, LI Zhi-Yuan. The Measurement of Displacement and Optical Force in Multi-Optical Tweezers. Chin. Phys. Lett., 2012, 29(1): 14214-014214.
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2012, Vol. 29 
