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Second-order optical nonlinear effects (second-harmonic and sum-frequencygeneration) are demonstrated in the telecommunication band by periodic polingof thin films of lithium niobate wafer-bonded on silicon substrates andrib-loaded with silicon nitride channels to attain ridge waveguide withcross-sections of ~ 2 {\mu}m2. The compactness of the waveguides results inefficient second-order nonlinear devices. A nonlinear conversion of 8% isobtained with a pulsed input in 4 mm long waveguides. The choice of siliconsubstrate makes the platform potentially compatible with silicon photonics, andtherefore may pave the path towards on-chip nonlinear and quantum-opticapplications.

Second-harmonic generation in periodically-poled thin film lithium niobate wafer-bonded on silicon