![Fig. 3.8 — Gradient force](https://i0.wp.com/opticaltweezers.org/wp-content/uploads/2015/11/Fig3_8.png?fit=660%2C331)
(a) Intensity distribution of a Gaussian beam (background) and corresponding optical gradient forces (arrows) on a dielectric particle whose refractive index is higher than that of the surrounding medium. (b) Optical potential along the radial direction (solid line) and its approximation by a harmonic potential (dashed line).
Fig. 3.8 — Gradient force