Chen, HaitaoCorboliou, VincentSolntsev, AlexanderChoi, Duk-YongVincenti, MariaDe Ceglia, DomenicoDe Angelis, CostantinoLu, YueruiNeshev, Dragomir2020-05-042020-05-042047-7538http://hdl.handle.net/1885/203583Two-dimensional transition-metal dichalcogenides (TMDCs) with intrinsically broken crystal inversion symmetry and large secondorder nonlinear responses have shown great promise for future nonlinear light sources. However, the sub-nanometer monolayer thickness of such materials limits the length of their nonlinear interaction with light. Here, we experimentally demonstrate the enhancement of the second-harmonic generation from monolayer MoSe2 by its integration onto a 220-nm-thick silicon waveguide. Such on-chip integration allows for a marked increase in the interaction length between the MoSe2 and the waveguide mode, further enabling phase matching of the nonlinear process. The demonstrated TMDC–silicon photonic hybrid integration opens the door to second-order nonlinear effects within the silicon photonic platform, including efficient frequency conversion, parametric amplification and the generation of entangled photon pairs.H Chen acknowledges financial support from the China Scholarship Council for PhD scholarship no. 201206110047. We would like to acknowledge support from the Australian Research Council through Discovery Projects and participation in the Erasmus Mundus NANOPHI project, contract number 2013 5659/002-001. Device fabrication was supported by the ACT node of the Australian National Fabrication Facilityapplication/pdfen-AU© The Author(s) 2017http:// creativecommons.org/licenses/by-nc-sa/4.0/201710.1038/lsa.2017.602019-11-25Creative Commons AttributionNonCommercial-ShareAlike 4.0 International License