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Negative Refraction at Visible Frequencies
Henri J. Lezec,
Jennifer A. Dionne,
Harry A. Atwater
Nanofabricated photonic materials offer opportunities for crafting the propagation and dispersion of light in
matter. We demonstrate an experimental realization of a two-dimensional negative-index material in the
blue-green region of the visible, substantiated by direct geometric visualization of negative refraction.
Negative indices are achieved using an ultra-thin Au/Si3N4/Ag waveguide sustaining a surface-plasmon-polariton
mode with anti-parallel group and phase velocities. All-angle negative refraction is observed at the interface
between this bimetal waveguide and a conventional Ag/Si3N4/Ag slot waveguide. The results may enable the
development of practical negative-index optical designs in the visible regime.