Optical force calculation in the ray-optics regime for beams with arbitrary complex amplitude profiles

Abstract

In this paper, we propose an augmented ray-optics model for computation of the optical force on spherical microscopic particles due to a beam with an arbitrary complex amplitude profile. The force calculation is based on simple analytical expressions derived considering relevant beam and lens parameters. The proposed model can provide the net optical force for a beam whose intensity or amplitude as well as phase profile in the entrance pupil of the lens can be arbitrary. Accuracy of the augmented model is demonstrated by comparing numerically with the existing model and with the experimental observations considering a focused vortex beam.