We present a theoretical description of resonantly enhanced, 4-bar-quasi-phasematched, second-harmonic generation in microdisks made of materials possessing 4-bar symmetry, such as GaAs, GaP and ZnSe. The theory describes the interplay between quasi-phasematching and the cavity-resonance conditions. For optimal conversion, all waves should be resonant with the microdisk and should satisfy the 4-bar-quasi-phasematching (QPM) condition. We explore chi(2) nonlinear mixing if one of the waves is not resonant with the microdisk cavity and calculate the conversion when either the fundamental or the second-harmonic wave is off-resonance with the microdisk cavity. We also describe perfectly destructive 4-bar-QPM where both the fundamental and SH are on-resonance with the cavity but SHG is suppressed.
Citation: Optics Express
Pub Type: Journals
second-harmonic generation, gallium arsenide, quasi-phasematching, microdisk resonators