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Numerical investigation of laser light scattering by dielectric microtoroids

We report the study of “photonic nanojet” (PNJ) formed by laser radiation scattering on single-layer ordered assembly of dielectric microtoroids placed on the silicone film surface. By means of the FDTD - method, the parameters of PNJ (length, width, intensity) are calculated. It has been shown that the main factor influencing the studied characteristics of PNJ is the spatial configuration of the particle scattering radiation, namely, the diameter of its internal section. It has been established that for certain configurations of the placement of toroids in the cluster, the PNJ ensemble is implemented with parameters significantly better than for a single toroid.