Diffraction radiation of three interacting nanoparticles

We consider diffraction radiation (ODR) arising from the uniform and rectilinear motion of an electron near three interacting nanoparticles. It is shown that as a result of the interaction, the characteristics of radiation from such a system change significantly. The calculation in the dipole approximation of the electric field strength, as well as the spectral-angular distribution of the ODR energy, was carried out. The calculated spectral and angular characteristics of radiation are analyzed. Conditions are obtained under which the interaction significantly affects the radiation efficiency. These results are compared with the results obtained by introducing the effective polarizability of a cluster of particles. The possibility of calculating the radiation field for an arbitrary number of interacting nanoparticles is shown. An algorithm for generalizing the problem to a large number of nanoparticles is proposed.