Óptica de conjuntos de nanopartículas de Au y Ag

Abstract

Surface lattice resonances (SLRs), associated with the coupling of localized surface plasmon resonances (LSPRs ) and on-in-plane diffracted waves, show resonances with high-quality factors and enhancement of local fields. These resonances supported by periodic arrays of metallic nanoparticles are favorable for diverse applications, like optoelectronics, vibrational spectroscopy, biosensing, and other applications. In this work, we reported the extinction cross-section of isolated and infinite 2D arrays of Au and Ag nanoparticles with different geometries (rods, discs, and spheres). The effects of size, dielectric environment, geometry, material, and lattice parameters in extinction spectra are observed, characterizing the LSPRs and SLRs. In addition, the near field was calculated for the resonant conditions for each simulated system. The numerical results were obtained using the boundary-element method (BEM) [also known as the method of moments (MoM)] implemented by free open-source software SCUFF-EM. Our numerical results show that the BEM method is suitable for describing the optical properties of isolated metallic nanoparticles and arranged periodic arrays.