Hyper–Rayleigh scattering

Within this theoretical model, upon setting the initial and final frequencies of light to the same value, the mathematics describe the hyper Rayleigh scattering optical activity.

[2][3] The team investigated the hyper Rayleigh scattering (at the second harmonic generation frequency) from chiral nanohelices made of silver.

[8] Moreover, HRS OA is a parametric process: the initial and final quantum mechanical states of the excited electron are the same.

Soon after the first demonstration of hyper Rayleigh scattering optical activity in metal nanoparticles,[3] the effect was replicated in organic molecules, specifically aromatic oligoamide foldamers.

The first demonstration of hyper-Rayleigh scattering optical activity at the third harmonic was reported by Valev's team in 2021, from silver nanohelices.

Diagram of the first observation of the hyper–Rayleigh scattering optical activity effect, from silver helical nanoparticles, upon illumination with circularly polarized light at frequency ω.