Plasmon-exciton interaction in two-particle nanostructures under the action of a magnetic field

Abstract

On the basis of a specially created theoretical model, the luminescence spectra and the rate of nonradiative transmission of energy from the exciton-activated quantum dot (QD) to the composite nanoparticle (NP) in the outer magnetic field, depending on the geometric and polarization parameters of the system, were calculated. In addition to the models of the quasi - homogeneous field of the dipole source, a model is shown in which the approximation of the dipole polarizability of plasmon nanoparticles is produced. In such a model, two types of NP were used: a solid metal particle and a layered particle with a dielectric core and a metal shell. When calculating the induced dipole moment, the NP was taken into account the inhomogeneous nature of the field created by the exciton-containing QD. The competition of radiation and nonradiative channels of decomposition of the excited state of the two-particle complex was taken into account. It is shown that in the spectra of the rate of nonradiative energy transfer from QD to NP, in addition to dipole bands, bands of multipole transitions of a higher order arise.It has been established that when changing the induction of an external magnetic field, there is a transformation of both radiative and nonradiative spectra. Plasmon bands of the speed spectra of non-radiation transfer of energy and luminescence are reduced by amplitude and split into two spectral components, the distance between which increases with increasing the induction of the magnetic field.