Influences of the Inserted Angle of an Optical Fiber for an Optical Trapping

Nobuyuki Watanabe; Kozo Taguchi

doi:10.4028/www.scientific.net/KEM.523-524.1053

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 523-524Influences of the Inserted Angle of an Optical...

Influences of the Inserted Angle of an Optical Fiber for an Optical Trapping

Abstract:

Biological cell could be trapped by a single laser beam from an optical fiber end inserted at an angle to a sample chamber. We have already developed an optical trapping system. A temperature stabilized 1480nm cw diode laser was used as the light source. The fiber end had a hemispherical micro-lens with 5μm radius of curvature for focusing the laser beam. These trapping fibers were inserted into a sample cell at an angle. The microsphere, 10μm diameter particle (refractive index 1.4), could be trapped. We theoretically analyzed the optical forces exerted on a microsphere by laser beams. The optical force on a microsphere divides itself into two components, the force in the beam axial direction of the light and a transverse force. The transverse optical force acted to pull the sphere back. We investigated the relation between the pulling force and the inserted angle of an optical fiber into a sample chamber. The microsphere is trapped at the point where the horizontal directed optical forces are balanced. We theoretically verified that the inserted angle of an optical fiber into a sample chamber was important parameter. It was found that a small inserted angle produced a weak pulling force.

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Periodical:

Key Engineering Materials (Volumes 523-524)

Pages:

1053-1058

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.523-524.1053

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Online since:

November 2012

Authors:

Nobuyuki Watanabe, Kozo Taguchi

Keywords:

Biological Cell, Optical Fiber, Optical Trapping, Single Laser Beam Trapping, Theoretical Analysis

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References

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