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MoS 2 is a layered quasi-2D material that can enhance effective third-order optical nonlinearity of waveguides. In this paper, we measured the optical loss of MoS 2 on silicon waveguides and compared the conversion efficiencies of four-wave mixing (FWM) in silicon waveguides with and without MoS 2 on the top cladding. Hybrid integration of the few-layer MoS 2 produced about 4 dB enhancement in the idler output of FWM. The Kerr coefficient of MoS 2 was obtained as (2.7±0.2)×10 −16 m 2 W −1 . The refractive index of MoS 2 was obtained from the characteristics of grating couplers.

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