Gain assisted nanocomposite multilayers with near zero permittivity modulus at visible frequencies

@article{Rizza2011GainAN,
  title={Gain assisted nanocomposite multilayers with near zero permittivity modulus at visible frequencies},
  author={Carlo Rizza and Andrea Di Falco and Alessandro Ciattoni},
  journal={Applied Physics Letters},
  year={2011},
  volume={99},
  pages={221107}
}
We have fabricated a nano-laminate by alternating metal and gain medium layers, the gain dielectric consisting of a polymer incorporating optically pumped dye molecules. From standard reflection-transmission experiments, we show that, at a visible wavelength, both the real and the imaginary parts of the permittivity e∥ attain very small values and we measure, at λ = 604 nm, |e∥|=0.04 which is 21.5% smaller than its value in the absence of optical pumping. Our investigation thus proves that a… 

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