Optical travelator: transport and dynamic sorting of colloidal microspheres with an asymmetrical line optical tweezers |
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| Authors: | FC Cheong CH Sow ATS Wee P Shao AA Bettiol JA van Kan F Watt |
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| Institution: | (1) Department of Physics, Faculty of Science, National University of Singapore, Blk S12, 2 Science Drive 3, Singapore, 117542, Singapore;(2) National University of Singapore Nanoscience and Nanotechnology Initiative, 2 Science Drive 3, Singapore, 117542, Singapore;(3) Centre for Ion Beam Applications, Department of Physics, National University of Singapore, Blk S12, 2 Science Drive 3, Singapore, 117542, Singapore |
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| Abstract: | We report the transport, funnelling and dynamic sorting of colloidal microspheres in an aqueous suspension using line optical
tweezers with asymmetrical intensity profiles. The line tweezers readily trapped and propelled the microspheres along the
length of the line tweezers. Using this simple technique, transporting and funnelling of microspheres within a microscopic
region were demonstrated. To illustrate the dynamic particle-sorting capability of the line tweezers, a binary colloidal system
comprising of microspheres with diameters of 1.1 μm and 3.2 μm were driven past the line tweezers by electrophoresis. As the
optical trapping force is dependent on the size of the microspheres, the line tweezers was able to change the path of the
larger spheres while exerting little influence on the smaller spheres thus sorting the two types of microspheres. At optimized
laser power and flow rate of microspheres, sorting efficiency greater than 90% has been achieved.
PACS 42.15.Eq; 87.80.Cc; 87.80.Fe; 82.70.Dd |
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