Metastructural systems of activated nanospheres and optical near-field resonances

Abstract

The near-field interaction of two spherical nanoparticles containing dense ensembles of two-or multilevel atoms in an external field of optical low-intensity radiation is shown to result in the formation of resonances whose frequencies differ considerably from the transition frequencies in the spectrum of the interacting atoms. Optical near-field resonances are shown to play an important role in metastructural systems composed of activated nanospheres. The reflectance of a metastructural system of activated nanospheres oriented along a certain direction depends strongly on the polarization and the frequency of external radiation, as well as on the concentration of impurity atoms inside the nanospheres and on their sizes.