Sahin, EzgiZabelich, BorisYakar, OzanNitiss, EdgarsBres, Camille-Sophie2021-07-312021-07-312021-07-312021-01-0110.1117/12.2582060https://infoscience.epfl.ch/handle/20.500.14299/180253WOS:000672733000017All-optical poling leads to an effective second-order nonlinearity (chi((2))) in centrosymmetric materials without the need for sophisticated fabrication techniques or material processing, through the periodic self-organization of the charges. The absence of the inherent chi((2)) in prevailing silicon-based platforms can be surmounted through all-optical poling. Using the induced effective chi((2)) in silicon nitride (Si3N4) waveguides, nonlinear frequency up-conversion processes, such as second-harmonic generation, were previously demonstrated on Si3N4. Here, we report near- and non-degenerate difference-frequency generation in all-optically poled Si3N4 waveguides. We show the agreement between the theory and the measurements and optimize achievable QPM bandwidth range, reaching conversion efficiency of 1 %/W.Opticssecond-order nonlinearityintegrated opticsall-optical polingdifference-frequency generationgratingstext::conference output::conference proceedings::conference paper