| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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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
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| Cite this article: |
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LING Lin, GUO Hong-Lian, HUANG Lu et al 2012 Chin. Phys. Lett. 29 014214 |
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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.
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| Keywords:
42.50.Wk
81.70.Fy
87.15.La
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Received: 09 November 2011
Published: 07 February 2012
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| PACS: |
42.50.Wk
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(Mechanical effects of light on material media, microstructures and particles)
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81.70.Fy
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(Nondestructive testing: optical methods)
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87.15.La
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(Mechanical properties)
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