Beam Optics Approach to the Ray Optics Model for the Optical Trapping Efficiency of Optical Tweezers

Abstract

The optical trapping efficiency of optical tweezers can be explained by the ray optics model when the particle size is much larger than the wavelength of laser light. The Optical trapping efficiency in the ray optics model does not depend on the particle size. However, The most experimental results usually show that the optical trapping efficiency decreases as the particle size decreases. In this study, we suggest a beam optics approach in order to take into account the particle size dependence effect in the ray optics model.