High efficiency second harmonic generation in transverse orientation patterned gallium phosphide waveguides
Optics
2025-05-29 v2 Applied Physics
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.
Cite
@article{arxiv.2412.15754,
title = {High efficiency second harmonic generation in transverse orientation patterned gallium phosphide waveguides},
author = {Antoine Lemoine and Brieg Le Corre and Lise Morice and Abdelmounaïm Harouri and Luc Le Gratiet and Grégoire Beaudoin and Julie Le Pouliquen and Karine Tavernier and Arnaud Grisard and Sylvain Combrié and Bruno Gérard and Charles Cornet and Yannick Dumeige and Konstantinos Pantzas and Isabelle Sagnes and Yoan Léger},
journal= {arXiv preprint arXiv:2412.15754},
year = {2025}
}