Résumé
This work concerns both the experimental and theoretical study of the enhancement of the second harmonic generation in nitrides-based slab photonic crystals.<br />This increase is the combination of two processes contained under the term of quasiphase matching conditions: i) the spatial localisation of the electromagnetic fields and ii) the realization of a phase matching condition between resonant modes at ω and 2ω.<br />The linear characterisation of the optical properties of these slab photonic crystals will determine the angular and spectral conditions that satisfy the quasi-phase matching. Once these conditions determine, a new numerical method based on the scattering matrix formalism is describe. This method highlights an enhancement by 106 of the second harmonic field intensity. Then these numerical results are compared to the one experimentally obtained where a 104 enhancement is measured. This study clearly<br />highlights the potentiality of slab III-N-based photonic crystal for applications in the blue-UV range.