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Simultaneously enhanced reflectance and transmittance greater than 35 dB aredemonstrated for the lasing spaser (or spasing) behavior in an active fishnetmetamaterial. In mimicking a lasing cavity, an equivalent active slab withLorentz dispersion for the index of refraction is established to model thespasing metamaterial through the Fabry-Perot effect. Numerical and theoreticalresults show good agreement in the equal enhancement of reflectance andtransmittance, as well as the non-monotonic dependence of the spasing intensityon the gain coefficient. In addition, directed emission of the spasing beam isverified numerically.

Modeling the directed transmission and reflection enhancements of the lasing spaser in active metamaterials