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Dynamic steering beams for efficient force measurement in optical manipulation
Authors:Xiaocong Yuan  Yuquan Zhang  Rui Cao  Xing Zhao  Jing Bu  and Siwei Zhu
Institution:1The Key Laboratory of Optoelectronic Information Science and Technology,Ministry of Education of China,Institute of Modern Optics,Nankai University,Tianjin 300071,China 2Nankai University Affiliated Hospital,Tianjin 300121,China
Abstract:An efficient and inexpensive method that uses a glass plate mounted onto a motorized rotating stage as a beam-steering device for the generation of dynamic optical traps is reported.Force analysis reveals that there are drag and trapping forces imposed on the bead in the opposite directions,respectively,in a viscous medium.The trapped bead will be rotated following the beam’s motion before it reaches the critical escape velocity when the drag force is equal to the optical trapping force.The equilibrium condition facilitates the experimental measurement of the drag force with potential extensions to the determination of the viscosity of the medium or the refractive index of the bead.The proposed technique can easily be integrated into conventional optical microscopic systems with minimum modifications.
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