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arXiv · 2412.15754

High efficiency second harmonic generation in transverse orientation patterned gallium phosphide waveguides

Antoine Lemoine·Brieg Le Corre·Lise Morice·Abdelmounaïm Harouri·Luc Le Gratiet·Grégoire Beaudoin·Julie Le Pouliquen·Karine Tavernier·Arnaud Grisard·Sylvain Combrié·Bruno Gérard·Charles Cornet·Yannick Dumeige·Konstantinos Pantzas·Isabelle Sagnes·Yoan Léger
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Abstract

Achieving high conversion efficiencies in second-order nonlinear optical processes is a key challenge in integrated photonics for both classical and quantum applications. This paper presents the first demonstration of Transverse Orientation-Patterned gallium phosphide (TOP-GaP) waveguides showing high-efficiency second harmonic generation. In such devices, first order modal phase matching is unlocked and optimized through the inversion of the nonlinear susceptibility along the vertical direction. We discuss here the theory behind modal phase matching in TOP structures, describe the fabrication process, and present linear and nonlinear characterizations of the TOP-GaP waveguides.

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Antoine Lemoine, Brieg Le Corre, Lise Morice, Abdelmounaïm Harouri, Luc Le Gratiet, Grégoire Beaudoin, Julie Le Pouliquen, Karine Tavernier, Arnaud Grisard, Sylvain Combrié, Bruno Gérard, Charles Cornet, Yannick Dumeige, Konstantinos Pantzas, Isabelle Sagnes, Yoan Léger. 2024-12-20. High efficiency second harmonic generation in transverse orientation patterned gallium phosphide waveguides. https://arxiv.org/abs/2412.15754

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