Optical characteristics of the nanoparticle coupled to a quantum molecular aggregate

Optical characteristics of a single nanoparticle, coupled to the one-dimensional quantum molecular aggregate is studied. Depending on the values of the coupling of the particle and its own frequency, with respect to the own frequency of the aggregated molecules, and the strength of the aggregation, the dynamical relative permittivity of the nanoparticle manifests the contribution from the exciton band, or/and the ones from the local level(s) caused by the particle. The refractive index and the extinction coefficient of the nanoparticle is also calculated. Published by AIP Publishing

Features of light absorption by a low-dimensional disordered molecular aggregate

Absorption of light by the exciton system of quantum molecular low-dimensional complexes (aggregates) is studied theoretically. It is shown that in the ground state, a rather low degree of disorder of H-aggregate impurities in the chain of J-aggregates causes a significant lowering of the J-band absorption intensity (along with the appearance of the H-band). A further increase in the degree of disorder of the impurities does not lead to a substantial rearrangement of the absorption spectrum of the system. There is no absorption in the case of the complete disorder. Published by AIP Publishing

Effect of the bichromatic electromagnetic field on the random molecular aggregate or the quantum spin chain

The linear response of the molecular aggregate chain with the random distribution of the strength of the neighboring intermolecular interactions to the bichromatic electromagnetic field has been calculated. The presence of the linearly polarized field produces additional resonance absorption at the combined frequencies of the circularly polarized and linear polarized field. The strength of the absorption oscillates with the amplitude and the frequency of the linearly polarized electromagnetic field. Additional resonance absorption is weaker than the main absorption at the frequency of the circularly polarized field. Similar behavior has been predicted for the interaction of the bichromatic magnetic field with the quantum spin-1/2 chain with the random distribution of the exchange constants for nearest neighbor spins

Resonance absorption and fluorescence of a bi-chromatic electromagnetic field by the molecule coupled to a quantum molecular aggregate

The resonance absorption and fluorescence of a bi-chromatic electromagnetic field by a single molecule, coupled to a one-dimensional quantum molecular aggregate is studied. Depending on the values of the coupling of the single molecule and its own frequency, with respect to the own frequency of the aggregated molecules, and the strength of the aggregation, the absorption and the fluorescence of the molecule show the contribution from the exciton band, or/and the ones from the local level(s) caused by the single molecule. The linear polarized component of the electromagnetic field produces additional resonances, compared to the only circular polarized component, due to the coherent interference. The strength of the absorption and the fluorescence, caused by those additional resonances, depends on the ratio of the magnitude and the frequency of the linear polarized component. For additional resonances the magnitude of the absorption and the frequency is the decaying oscillating function of the mentioned ratio. Copyright (C) EPLA, 201

Modification of the luminescent characteristics belonging to the molecule that interacts with the exciton states of the J-aggregate

A quantum theory for the light absorption and photoluminescence of a molecule (luminophore) interacting with a J-aggregate linear molecular chain is constructed. It is shown that together with the band states of Frenkel excitons in the molecular chain the contribution to light absorption and luminescence comes from local levels that split off from the exciton band as a result of the interaction between the molecular chain and the luminophore. It is also demonstrated that the contribution to light absorption and photoluminescence from local levels is non-linearly dependent on the coupling parameter between the luminophore and the J-aggregate molecular chain. Published by AIP Publishing