Coherent Amplification of Optical Pulses in Metamaterials

In this paper, we theoretically study propagation of steady-state ultrashort pulse in dissipative medium. We considered two cases: 1) medium consisting of lossy metallic nanostructures embedded into a gain material and 2) the gain material is embedded directly into the nanostructures. We found the shape and the velocity of an optical pulse coupled with the polarization wave.