Experimental Analysis of Optical Trapping System Using Tapered Hemispherically Lensed Optical Fiber |
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Authors: | Kozo Taguchi Kentaro Atsuta Takeshi Nakata Masahiro Ikeda |
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Affiliation: | (1) Fukuyama University, Department of Electronics and Electrical Engineering, Gakuen-cho, Fukuyama, Hiroshima 729-0292, Japan |
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Abstract: | We describe the operation and performance of an optical fiber trap realized using a tapered hemispherically lensed optical fiber. Axial and transverse trapping forces exerted on a microsphere are experimentally analyzed to corroborate the optical trapping using an optical fiber. Experimental results are as follows. (i) Transverse force Ftr acting on a sphere is a restoring force that acts to pull the microsphere back to the center of trap. (ii) Axial force Fax always acts to push a sphere in the direction of the beam away from the trapping fiber end. (iii) Vector sum of Ftr and Fax acting on a sphere gives a restoring force directed back to the stable point. (iv) Transverse force Ftr plays a significant role in trapping a micro-sized object by means of an optical fiber.This paper was originally presented at the 5th International Conference on NEAR FIELD OPTICS and RELATED TECHNOLOGIES (NFO-5), which was held on December 6–10, 1998 at Coganoi Bay Hotel, Shirahama, Japan, in cooperation with the Japan Society of Applied Physics and Mombusho Grant-in Aid for Scientific Research on Priority Areas “Near-field Nano-optics” Project, sponsored by Japan Society for the Promotion of Science. |
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Keywords: | optical fiber laser beam effects optical trapping axial trapping force transverse trapping force |
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