Surface Second Harmonic Generation from AB-Type Stacks of Dielectric Nanolaminates

Surface Second Harmonic Generation (SHG) is a second order nonlinear process that can only be observed in materials with broken inversion symmetry. However, due to the discontinuity of the medium and the large electric field gradient at a surfaces, the inversion is broken and SHG can be generated there, too [1]. A. Pakhamov and et al [2] theoretically studied the surface SHG from ultrathin stacks of TiO 2 /SiO 2 . There many surfaces contribute to SHG in a subwavelength arrangement. They have predicted SHG enhancement from superimposing the signals from each surfaces with transfer matrix method.