Hyper–Rayleigh scattering

Hyper–Rayleigh scattering optical activity ( RAY-lee), a form of chiroptical harmonic scattering, is a nonlinear optical physical effect whereby chiral scatterers (such as nanoparticles or molecules) convert light (or other electromagnetic radiation) to higher frequencies via harmonic generation processes, in a way that the intensity of generated light depends on the chirality of the scatterers. "Hyper–Rayleigh scattering" is a nonlinear optical counterpart to Rayleigh scattering.

Source: Wikipedia — Hyper–Rayleigh scattering (CC BY-SA 4.0)