We have carefully examined the surface plasmon modes in the metal-dielectric-metal structures. By using the direction of energy decay to identify the sign of effective refractive index, we have obtained different results from previous reports.
© 2009 The Optical Society
(240.0240) Optics at surfaces : Optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons
(350.0350) Other areas of optics : Other areas of optics
(350.3618) Other areas of optics : Left-handed materials
T. Yang and K. B. Crozier, "The Sign of Refractive Index of Surface Plasmons in Metal-Dielectric-Metal Structures," in Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, OSA Technical Digest (CD) (Optical Society of America, 2009), paper JWA113.
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