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Article Dans Une Revue Optics Express Année : 2023

Intrinsic polarity inversion in III-nitride waveguides for efficient nonlinear interactions

Résumé

III-nitrides provide a versatile platform for nonlinear photonics. In this work, we explore a new promising configuration – composite waveguides containing GaN and AlN layers with inverted polarity, i.e., having opposite signs of the χ (2) nonlinear coefficient. This configuration allows us to address the limiting problem of the mode overlap for nonlinear interactions. Our modelling predicts a significant improvement in the conversion efficiency. We confirm our theoretical prediction with the experimental demonstration of second harmonic generation with an efficiency of 4%W -1 cm -2 using a simple ridge waveguide. This efficiency is an order of magnitude higher compared to the previously reported results for III-nitride waveguides. Further improvement, reaching a theoretical efficiency of 30%W -1 cm -2 , can be achieved by reducing propagation losses.
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Dates et versions

hal-04211196 , version 1 (19-09-2023)

Identifiants

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M. Gromovyi, N. Bhat, H. Tronche, P. Baldi, M. El Kurdi, et al.. Intrinsic polarity inversion in III-nitride waveguides for efficient nonlinear interactions. Optics Express, 2023, 31 (19), pp.31397-31409. ⟨10.1364/OE.501221⟩. ⟨hal-04211196⟩
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