Far-field super-resolution imaging using a steerable photonic nanojet

We demonstrate numerically the feasibility of super-resolution optical detection and imaging using scanning photonic jet excitation and far-field scatterometry. Illuminating a glass (SiO₂) micro-lens with monochromatic computed structured light profiles, we scantwo sub-classical gold (Au) nanoparticles, separated below the diffraction limit and located near the micro-lens, by a photonic nanojet. The resulting far-field scattering data reveal the positions of the two nanoparticles as well as the gap between them. The proposed super-resolution imaging modality is label-free and involves no moving parts and no manipulation of the ambient medium refractive index.