Gold nanoparticles and plasmonics: let’s make the electrons dance!

Plenary conference given by Pr. Olivier Pluchery at the international conference GOLD 2022 held in Québec city on 19-July-2022 Gold nanoparticles are famous for their ruby-red color due to the localized surface plasmon resonance. This color is the visible manifestation of an intimate coupling between an optical wave and the electrons, that takes place at the nanometer scale well below the diffraction limit. This "dance of the electrons" occurs at a very high tempo set by the optical frequency. The resonance is the visible sign of local electric field amplification that has been scrutinized for two decades and used for biosensing, for controlling photothermal effects, or for innovative thermo-therapies. This talk reviews the fundaments of plasmonics with a didactic approach, and also highlights a few of these applications. 0' Presentation of O. Pluchery 2'00" Global introduction to plasmonics 9'47" The Surface Plasmon Polariton (SPP) 20'55" SPP for signal processing 29'15" The plasmon resonance in nanoparticles (LSPR) 46'40" When plasmonics meets electrstatics: the hot electron physics