Year: 2024
Type: article
Abstract: Optical second-harmonic generation (SHG) is achieved using adsorbed gold nanoparticles (AuNPs) with an average diameter of 16 nm at the aqueous solution–air 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 aqueous solution–air interface that is sensitive to the AuNP surface excess and one arising from the bulk aqueous phase. The latter is an incoherent signal also known as hyper-Rayleigh scattering (HRS). The results agree with those of an analysis involving Gaussian beam propagation optics and a Langmuir-like isotherm. Discrepancies are revealed for the largest AuNP concentrations used and indicate a new route for the design of soft metasurfaces.
Source: Photonics
Institutions: Centre National de la Recherche Scientifique, Université Paris Cité, Interfaces Traitements Organisation et Dynamique des Systèmes, Lyon 1 Université, Institut Lumière Matière, École Polytechnique Fédérale de Lausanne, University of Limerick, Université de Montpellier, Laboratoire Charles Coulomb
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,728
OpenAlex ID: W4401869668