TUNABLE OUTPUT OF SECOND HARMONIC GENERATIONS IN PHOTONIC QUANTUM WELL STRUCTURES MADE OF NONLINEAR MATERIAL

Abstract

We have studied multiple wavelength second harmonic generation (SHG) in one-dimensional multiple photonic quantum-wells (PQWs) structure made of linear and nonlinear material. The numerical simulations show that the devised sample can achieve simultaneously multiple wavelength SHG with nearly identical conversion efficiency by the modulation of both the linear and nonlinear optical coefficient. The fundamental wave frequencies are aimed at the defect states by modulating the linear optical coefficient. The optimal arrangement of the polarization directions of the ferroelectric domains in multiple PQWs are determined by simulated annealing method. By tuning the polarization directions of the domains, the conversion efficiencies of "forward" and "backward" for multiple wavelength SHG can be flexibly modulated.