Enhanced second- and third-harmonic generation and induced photoluminescence in two-dimensional GaN photonic crystal Auteur(s): Coquillat D., Vecchi Gabriele, Comaschi Carlo, Marco Malvezzi Andrea, Torres Jeremi, Le vassor d'yerville Marine (Article) Publié: Applied Physics Letters, vol. 87 p.101106 (2005) Ref HAL: hal-00390422_v1 Exporter : BibTex | endNote Résumé: We observed visible second-harmonic and ultraviolet third-harmonic fields generated in reflection from the surface of a two-dimensional triangular GaN/sapphire photonic crystal. When the pump radiation resonates with a photonic mode, enhancement factors as high as 250 and 3500 occurred for the second- and third-harmonic signals, respectively, as compared to the unpatterned GaN slab. The very large increase of third-harmonic field, with a photon energy exceeding that of the electronic band gap, was used as an efficient mechanism to induce GaN hotoluminescence. |