Infrared Radiation from Rough Surface
  We consider generation of diffusive radiation by a charged particle passing through a random stack of plates in the infrared region. Diffusive radiation originates due to multiple scattering of pseudophotons on the plates. To enhance the radiation intensity one needs to make the scattering more effective. For this goal we suggest to use materials with negative dielectric constant . 
E.A. Ayryan, A.H. Gevorgyan, K.B.Oganesyan
physics.acc-ph