paper 150404042212

Abstract

We found that the extraordinary transmission and reflection of a finite bandwidth can occur at the same wavelength when the electromagnetic wave is incident on a periodic array of PT -symmetric dimers embedded in a metallic film. Remarkably, this phenomenon vanishes if the metallic substrate is lossless while keeping other parameters unchanged. When the metafilm is adjusted to the vicinity of a spectral singularity, tuning the substrate dissipation to a critical value can lead to supper scattering in stark contrast to what would be expected in conventional systems. This phenomenon implies that strong coherent radiation may be able to generate from a cavity having gain elements by tuning cavity dissipation to a critical value.

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Simin Feng