Engineering molecular aggregate spectra

TL;DR

This paper investigates how depositing linear molecular aggregates on metal surfaces significantly alters their optical properties due to dipole-image interactions, affecting exciton bands and absorption spectra.

Contribution

It demonstrates the impact of surface-induced dipole interactions on the optical spectra of molecular aggregates, highlighting the importance of molecular arrangement.

Findings

Optical properties change drastically on metal surfaces

Dipole-image interactions re-structure exciton bands

Absorption spectra depend on dipole orientation

Abstract

We show that optical properties of linear molecular aggregates undergo drastic changes when aggregates are deposited on a metal surface. The dipole-dipole interactions of monomers with their images can result in strong {re-structuring of both the exciton band and the absorption spectrum, depending on the arrangement of the monomer transition dipoles with respect to the surface.