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Enhanced second- and third-harmonic generation and induced photoluminescence in a two-dimensional GaN photonic crystal

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6 Author(s)
Coquillat, D. ; Groupe d’Etude des Semiconducteurs, UMR 5650, CNRS-Université Montpellier II, 34095 Montpellier Cedex 5, France ; Vecchi, G. ; Comaschi, Carlo ; Malvezzi, Andrea Marco
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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 photoluminescence.

Published in:

Applied Physics Letters  (Volume:87 ,  Issue: 10 )

Date of Publication:

Sep 2005

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