The role of current loop in harmonic generation from magnetic   metamaterials in two polarizations
  In this paper, we investigate the role of the current loop in the generation of second and third harmonic signals from magnetic metamaterials. We will show that the fact that the current loop in the magnetic resonance acts as a source for nonlinear effects and it consists of two orthogonal parts, leads to the generation of two harmonic signals in two orthogonal polarizations. 
Iman Sajedian, Inki Kim, Abdolnasser Zakery, Junsuk Rho
physics.optics