Numerical analysis of the functional properties of the 3D resonator of a plasmon nanolaser with regard to nonlocality and prism presence via the Discrete Sources method

The influence of the nonlocality effect on the optical characteristics of the near field of a plasmonic nanolaser resonator is considered. A computer model based on the Discrete Sources method has been developed for the analysis of the near-field characteristics of a layered nanoparticle located on a transparent substrate in an active medium. In this case, the nonlocality of the plasmon metal is taken into account within the framework of a Generalized Nonlocal Optical Response model. Excitation of a particle by both propagating and evanescent waves is investigated. "Optimal" directions of external excitation have been established. It is found that excitation by an evanescent wave leads to a higher intensity of the near field. It is demonstrated that accounting for the nonlocal effect in the plasmonic metal significantly reduces the field amplification factor.

Влияние пространственной дисперсии в металлах на оптические характеристики биметаллических плазмонных наночастиц

The problem of diffraction of an electromagnetic plane wave field on a core-shell nanoparticle composed of two plasmon metals is considered. The effect of spatial dispersion in metals on the absorption cross section is investigated on the basis of the Discrete Sources method. Various combinations of core and shell metals: Au@Ag and Ag@Au of spheroidal particles, as well as the effect of elongation and asymmetry of particle geometry on energy absorption are being studied. It was found that taking into account the spatial dispersion, both in the core and in the shell, leads to a significant decrease in the absorption cross section and a shift of the plasmon resonance to the shorter wavelength region.