Chen Haitao, Corboliou Vincent, Solntsev Alexander S, Choi Duk-Yong, Vincenti Maria A, de Ceglia Domenico, de Angelis Costantino, Lu Yuerui, Neshev Dragomir N
Nonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601, Australia.
Institut d'Optique Graduate School, Université Paris-Sud, Palaiseau 91127, France.
Light Sci Appl. 2017 Oct 20;6(10):e17060. doi: 10.1038/lsa.2017.60. eCollection 2017 Oct.
Two-dimensional transition-metal dichalcogenides (TMDCs) with intrinsically broken crystal inversion symmetry and large second-order 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 MoSe 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 MoSe 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.
具有内在晶体反演对称性破缺和大二阶非线性响应的二维过渡金属二卤化物（TMDCs）在未来非线性光源方面展现出了巨大潜力。然而，这类材料亚纳米级的单层厚度限制了其与光的非线性相互作用长度。在此，我们通过将单层MoSe集成到厚度为220纳米的硅波导上，实验证明了二次谐波产生的增强。这种片上集成显著增加了MoSe与波导模式之间的相互作用长度，进而实现了非线性过程的相位匹配。所展示的TMDC-硅光子混合集成开启了硅光子平台内二阶非线性效应的大门，包括高效频率转换、参量放大以及纠缠光子对的产生。
