Title :
Optical micro-manipulation of beads in axial and lateral directions with upward and downward-directed laser beams
Author :
Ukita, Hiroo ; Saitoh, Takashi
Author_Institution :
Fac. of Sci. & Eng., Ritsumeikan Univ., Shiga, Japan
Abstract :
We measured the optical-trapping force on polystyrene and glass microspheres of different diameters in two orthogonal directions with upward-directed and downward-directed laser beams. We confirmed that the upward-directed beam has significantly higher trapping efficiency than the downward one for both polystyrene glass microspheres. The experimental minimum trapping powers are in fairly good agreement with the theoretical ones for axial trapping, but not in good agreement for lateral trapping
Keywords :
laser beam effects; radiation pressure; axial directions; axial trapping; beads; downward-directed laser beams; glass microspheres; lateral directions; lateral trapping; minimum trapping powers; optical micro-manipulation; optical-trapping force; polystyrene glass microspheres; polystyrene microspheres; trapping efficiency; upward-directed laser beams; Charge carrier processes; Force measurement; Glass; Gravity; Laser beams; Laser theory; Optical microscopy; Optical refraction; Particle beams; Power measurement;
Conference_Titel :
LEOS '99. IEEE Lasers and Electro-Optics Society 1999 12th Annual Meeting
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-5634-9
DOI :
10.1109/LEOS.1999.813532
