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In this paper, super-focusing using radiationless electromagneticinterference is extended to the visible regime. It is shown that thehighest-order mode of a specifically designed metal-dielectric waveguide arraycan provide the rapidly oscillating source field for radiationlessinterference. Using finite-difference time-domain simulations, an examplestructure is demonstrated. This structure provides focusing to 0.21 of theoptical wavelength at a distance of half the optical wavelength from thesource.

Proposal for Optical Super-Focusing with a Metal-Dielectric Waveguide Array