Shape-Controlled Second-Harmonic Scattering from Gold Nano-Tetrapods

In the search for efficient building blocks for nonlinear metamaterials, plasmonic nanoparticles have received considerable attention. Their quadratic nonlinear optical properties result from a complex interplay between the nature of the bulk material, the object shape, surface defects, and retardation effects. This versatility can be used to tailor the properties of the resulting material. However, despite extensive investigation, separating and controlling these contributions still pose a challenge. In this report, we control the morphology of colloidal gold nanoparticles with tetrahedral symmetry and explore their second harmonic scattering response. The material itself is centrosymmetric but not the shape, conferring to the first hyperpolarizability an almost purely octupolar symmetry. Gradually reshaping the nanoparticles into spheres (and thus decreasing their asymmetry) reduces their nonlinear response, showing that it is controlled by the morphology. These results open the way toward new kinds of nonlinear plasmonics platforms and imaging probes.

Jieli Lyu, Fabien Rondepierre, Christian Jonin, Pierre-Franco̧is Brevet, Cyrille Hamon and Doru Constantin, J. Phys. Chem. C (2022) 126, 9831−9835

(in collaboration with Laboratoire de Physique des Solides, University Paris-Saclay and CNRS and Institut Charles Sadron, Université de Strasbourg and CNRS)

https://pubs.acs.org/doi/abs/10.1021/acs.jpcc.2c01867