The process of light scattering by two-layer spheroids consisting of a dielectric core and a silver shell, which depends on the length of an incident wave and particle geometry, is considered. One optical resonance is observed when the foci of the nuclear surfaces and the shell coincide, while when this condition is violated, additional resonances appear. Namely, in the absorption and scattering bands, resonances were found, including previously unknown ones, the position and intensity of which depended on the shell thickness, the shape of the spheroid and its core. To substantiate the reliability of the results obtained, the convergence of the calculations was analyzed depending on the number of harmonics which were taken into consideration in the calculations.
Perturbation theory of optical resonances of deformed dielectric spheres
