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Published April 20, 2007 | Supplemental Material
Journal Article Open

Negative Refraction at Visible Frequencies


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 spectrum, substantiated by direct geometric visualization of negative refraction. Negative indices were achieved with the use of an ultrathin Au-Si_3N_4-Ag waveguide sustaining a surface plasmon polariton mode with antiparallel group and phase velocities. All-angle negative refraction was observed at the interface between this bimetal waveguide and a conventional Ag-Si_3N_4-Ag slot waveguide. The results may enable the development of practical negative-index optical designs in the visible regime.

Additional Information

© 2007 American Association for the Advancement of Science. Received 26 December 2006; accepted 12 March 2007; Published online 22 March 2007. Supported by a National Defense Science and Engineering Graduate Fellowship administered by the Army Research Office (J.A.D.) and by the Air Force Office of Scientific Research under Plasmon Multidisciplinary University Research Initiative FA9550-04-1-0434. We thank L. Sweatlock, D. Pacifici, R. Walters, B. Kayes, N. Vu, G. Derose, and A. Scherer for engaging discussions and technical assistance.

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