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Resolving Discrepancy between Theoretical and Experimental Optical Trapping Forces Using Effects of Beam Waist and Trapping Position Displacement due to Gravity |
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| Authors: | Hiroo Ukita Takashi Saitoh Noboru Sakahara |
| Institution: | (1) Faculty of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu Shiga, 525-8677, Japan;(2) Currently with NEC, Kawasaki 210-0012, Japan;(3) Currently with NEC, Kashiwa, Chiba 277-0841, Japan |
| Abstract: | Optical trapping forces of polystyrene microspheres are analyzed both theoretically and experimentally, and comparisons are made between the two. Discrepancies are mainly caused by straight-ray approximation for axial trapping, and by trapping-position vertical displacement due to gravity for transverse trapping. |
| Keywords: | optical tweezers optical trapping force trapping position microsphere straight ray parabolic ray beam waist axial trapping transverse trapping |
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