Quantifying the Plasmonic Character of Optical Excitations in a Molecular J-Aggregate.

ABSTRACT: The definition of plasmon at the microscopic scale is far from being understood. Yet, it is very important to recognize plasmonic features in optical excitations, as they can inspire new applications and trigger new discoveries by analogy with the rich phenomenology of metal nanoparticle plasmons. Recently, the concepts of plasmonicity index and the generalized plasmonicity index (GPI) have been devised as computational tools to quantify the plasmonic nature of optical excitations. The question may arise whether any strong absorption band, possibly with some sort of collective character in its microscopic origin, shares the status of plasmon. Here we demonstrate that this is not always the case, by considering a well-known class of systems represented by J-aggregates molecular crystals, ch

SUBMITTER: Guerrini M 

PROVIDER: S-EPMC6524342 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature