Enhanced second-harmonic generation from two-dimensional MoSe2 on a silicon waveguide

• 来源期刊: 光：科学与应用（英文版）
• 关键词: 2D material MoSe2 SHG waveguide
• 年，卷（期）: 2017,（4）
• 页码范围: 45-51
• 页数: 7页
• 语种: 英文
• DOI: 10.1038/lsa.2017.60

摘要

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 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.