Analytic expressions for radiation force on a sphere in a loosely focused Gaussian beam are derived in suitable form for applications by the photon stream method in the ray-optics regime. For perfect reflecting spheres, an analytic solution for the scattering force and a simplified expression for the gradient force are obtained. The computation results presented are consistent with those of previous theoretical studies and reported experimental results.
© 2006 Optical Society of America
Original Manuscript: July 13, 2005
Revised Manuscript: November 15, 2005
Manuscript Accepted: December 13, 2005
Sang Bok Kim and Sang Soo Kim, "Radiation forces on spheres in loosely focused Gaussian beam: ray-optics regime," J. Opt. Soc. Am. B 23, 897-903 (2006)