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1 May 2012 Dual hyperbolic-elliptic media
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Recent disclosures on subwavelength plasmonic crystals, like the potential excitation of a pair of coexisting wave-fields with opposite refraction, only can be understood by considering two dispersion branches with completely different features that characterize the metamaterial. One branch gives elliptic-like dispersion and the other provides hyperbolic-like dispersion. However the effective medium approximation, also known as Rytov approximation, is not consistent with both curves simultaneously. We follow an approach leading to a single curve that allows a complete description of both diffraction behaviors concurrently. Importantly only two parameters of the closed curve, together with the lattice period, fulfill such a complete picture. In addition, our semi-analytical approach may include more general situations straightforwardly.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Carlos J. Zapata-Rodríguez, David Pastor, Pablo Cencillo, Mario Avellaneda, Slobodan Vukovic, and Juan J. Miret "Dual hyperbolic-elliptic media", Proc. SPIE 8423, Metamaterials VII, 84231Z (1 May 2012);

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