PhotonicsPublished 3 March 2025Large first hyperpolarizability of the Au@Ag core-shell nanoparticles as compared to the corresponding alloyed nanoparticles resulting from laser annealingIsabelle Russier-Antoine · Christian Jonin · Emmanuel Benichou · Franck Bertorelle · Pierre-François BrevetFrontiers in Photonicsdoi 10.3389/fphot.2025.1548555