Plasmonic sensing: FDTD calculations to interpret experimental LSPR water adsorption isotherms

Benjamin Demirdjian (1) , Igor Ozerov (1) , Frédéric Bedu (1) , Alain Ranguis (1) , Claude R Henry (1)

1 CINaM - Centre Interdisciplinaire de Nanoscience de Marseille

Finite-Difference Time-Domain (FDTD) calculations are widely used to interpret experimental Localized Surface Plasmon Resonance (LSPR) spectra. With FDTD it is possible to predict the physical parameters of the nanostructures that will theoretically give the best experimental LSPR signals. This information is crucial for optimizing sample fabrication and saving significant time. FDTD is also essential to control and calibrate various parameters of the nanostructures and to understand effects such as a Cr adhesion layer and LSPR sensor size distribution. Finally, for water adsorption sensing, FDTD confirms that the LSPR peak shift strictly follows Campbell’s model, even at submonolayer coverage.

Mots clés: LSPR; FDTD; Gold nanoparticles; Water adsorption; isotherm; Plasmonic sensing

Domaines: Matériaux

Benjamin Demirdjian, Igor Ozerov, Frédéric Bedu, Alain Ranguis, Claude R Henry. Plasmonic sensing: FDTD calculations to interpret experimental LSPR water adsorption isotherms. Chemical Physics Letters, 2024, 837, pp.141063. ⟨10.1016/j.cplett.2023.141063⟩. ⟨hal-04373901⟩