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Optical properties of J-aggregates of pseudoisocyanine dye on inhomogeneous island films

This study investigates the optical properties of the molecular layers of a pseudoisocyanine dye and its J-aggregates deposited on the surface of an Ag island film, which is an inhomogeneous ensemble of nanoparticles. Such a hybrid structure has an absorption that does not equal the sum of the inhomogeneously broadened plasmon resonance of nanoparticles and the absorption bands of molecular forms (e.g., monomers and aggregates) of the dye. At the maximum absorption and fluorescence of the J-aggregates, a spectral dip with two peaks on either side is observed. This is caused by the splitting of the hybrid state owing to the strong coupling of the plasmons of an inhomogeneous ensemble of nanoparticles with the excitons of the J-aggregates.