Spectral and Near-Field Scattering Characteristics of Two-Layered Metal-Containing Nanoparticles in Absorbing Matrices

The influence of the structure, size, and composition of two-layered nanoparticles with a silver nanoshell situated in copper phthalocyanine films on the overall optical response of the hybrid nanomaterial was theoretically studied. The characteristics of surface plasmon resonance absorption (SPRA) bands and near-field scattering of the two-layered plasmonic nanospheres were investigated using Mie theory taking into account matrix absorption and internal size effects. It was shown that the SPRA band could be tuned to exciton absorption bands of the organic component by varying the refractive index and volume fraction of the dielectric core in nanoparticles with metal nanoshells. Two attenuation peaks with comparable intensities that were sensitive to a change of the system optical and geometric parameters were observed in a strong coupling regime in the visible spectral region. The results could be used to develop nanostructured functional elements for nanophotonics, photovoltaics, and sensing.