%0 Journal Article %T Gold Nanoparticles at a Liquid Interface : Towards Soft Nonlinear Metasurface %+ Interfaces, Traitements, Organisation et Dynamique des Systèmes (ITODYS (UMR_7086)) %+ Institut Lumière Matière [Villeurbanne] (ILM) %+ Ecole Polytechnique Fédérale de Lausanne (EPFL) %+ University of Limerick (UL) %+ Laboratoire Charles Coulomb (L2C) %A Schaming, Delphine %A Maurice, Anthony %A Gumy, Frédéric %A Scanlon, Micheál, D %A Girault, Hubert, H %A Brevet, Pierre-François %A Jonin, Christian %< avec comité de lecture %@ 2304-6732 %J Photonics %I MDPI %V 11 %N 9 %P 789 %8 2024-08-26 %D 2024 %R 10.3390/photonics11090789 %K metasurfaces %K second-harmonic generation %K liquid interfaces %K gold nanoparticles %Z Engineering Sciences [physics]/Optics / Photonic %Z Engineering Sciences [physics]/MaterialsJournal articles %X Optical Second Harmonic Generation (SHG) is obtained from adsorbed gold nanoparticles with an average diameter of 16 nm at the air / aqueous solution interface in reflection. A detailed analysis of the depth profile of the SHG intensity detected shows that two contributions appear in the overall signal, one arising from the air / aqueous solution interface that is sensitive to the gold nanoparticles surface excess and one arising from the bulk aqueous phase. The latter is an incoherent signal also known as Hyper Rayleigh scattering. The results are in agreement with an analysis involving Gaussian beam propagation optics and Langmuir isotherm. It also reveals discrepancies for the largest concentrations used and proposes a new route for the design of soft metasurfaces. %G English %2 https://hal.science/hal-04677322v1/document %2 https://hal.science/hal-04677322v1/file/photonics-11-00789.pdf %L hal-04677322 %U https://hal.science/hal-04677322 %~ CNRS %~ UNIV-LYON1 %~ SPHERE %~ L2C %~ INC-CNRS %~ UNIV-MONTPELLIER %~ ILM %~ UDL %~ UNIV-LYON %~ UNIV-PARIS %~ UNIVERSITE-PARIS %~ UP-SCIENCES %~ ITODYS %~ UM-2015-2021 %~ UM-EPE