We present the detailed behavior of the axial force acting on a dielectric sphere exerted by the optical pressure of a focused Gaussian laser beam. Comparison is made between the numerical results and those calculated from the radiation pressure cross section. There is also a discussion as to whether the expressions for the axial force given in this paper are consistent with the previously reported experimental results. Moreover, a simple experimental method to measure the axial force on a polystyrene sphere suspended in water is demonstrated, and fairly good agreement between theoretical and experimental results was obtained.
© 1998 Optical Society of America
Original Manuscript: October 27, 1997
Revised Manuscript: April 15, 1998
Published: September 20, 1998
Shojiro Nemoto and Hiroyoshi Togo, "Axial force acting on a dielectric sphere in a focused laser beam," Appl. Opt. 37, 6386-6394 (1998)