Figure 2.

A spherical NP of r = 40 nm irradiated by an x-polarized Gaussian beam of 446 nm in air. (a) ${\parallel E\parallel }^2$ distribution in the x–z cross section of NP at y = 0. (b) The optical traction distribution (vector: optical traction) on the surface of the NP, and the morphology of the elastically deformed NP (color: magnitude of normalized displacement) for Stage I and II, where the inward arrows (blue): pressing traction (pressure) and the outward arrows (red): stretching traction. A spherical NP is deformed to an oblate-ellipsoidal one.