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Dispersion and Losses at Air-DNG and Air-Chiral Interfaces

Canto, João R. ; Matos, S.A. ; Paiva, C. R. ; Barbosa, A.

Dispersion and Losses at Air-DNG and Air-Chiral Interfaces, Proc Metamorphose International Congress on Advanced Electromagnetic Materials in Microwaves and Optics - METAMATERIALS, Pamplona, Spain, Vol. 1, pp. 353 - 355, September, 2008.

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When modeling metamaterials with negative parameters both dispersion and losses should be taken into account to uphold causality. In this communication we show that this is inescapable even when structures as simple as planar interfaces (either between air and a DNG medium or between air and a chiral medium) are ad-dressed. We show that, only using a causal dispersion model, can we obtain results with reasonable physical be-havior, thereby overcoming the strange results displayed by surface modes in the lossless dispersive case.