Science Daily  September 20, 2021 In 3D isotropic liquids, optical third-harmonic generation is forbidden, with circularly polarized light (CPL). Yet the associated nonlinear susceptibility directly influences the optical properties at the fundamental frequency by intensity dependence. An international team of researchers (UK, Germany) has revealed the hidden third-harmonic optical properties upon circularly polarized light (CPL) by demonstrating a new effect, in hyper-Rayleigh scattering. The intensity of light scattered at the third-harmonic frequency of the CPL incident light depends on the chirality of the scatterers. It is referred to as third harmonic (hyper) Rayleigh scattering optical activity (THRS OA) and was […]