Enhancing Si3N4Waveguide Nonlinearity with Heterogeneous Integration of Few-Layer WS2

Yuchen Wang*, Vincent Pelgrin, Samuel Gyger, Gius Md Uddin, Xueyin Bai, Christian Lafforgue, Laurent Vivien, Klaus D. Jöns, Eric Cassan, Zhipei Sun

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)
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The heterogeneous integration of low-dimensional materials with photonic waveguides has spurred wide research interest. Here, we report on the experimental investigation and the numerical modeling of enhanced nonlinear pulse broadening in silicon nitride waveguides with the heterogeneous integration of few-layer WS2. After transferring a few-layer WS2 flake of similar to 14.8 mu m length, the pulse spectral broadening in a dispersion-engineered silicon nitride waveguide has been enhanced by similar to 48.8% in bandwidth. Through numerical modeling, an effective nonlinear coefficient higher than 600 m(-1) W-1 has been retrieved for the heterogeneous waveguide indicating an enhancement factor of larger than 300 with respect to the pristine waveguide at a wavelength of 800 nm. With further advances in two-dimensional material fabrication and integration techniques, on-chip heterostructures will offer another degree of freedom for waveguide engineering, enabling high-performance nonlinear optical devices, such as frequency combs and quantum light sources.

Original languageEnglish
Pages (from-to)2713–2721
Number of pages9
JournalACS Photonics
Issue number9
Publication statusPublished - 15 Sept 2021
MoE publication typeA1 Journal article-refereed


  • hybrid photonic waveguides
  • integrated nonlinear optics
  • low-dimensional materials
  • silicon photonics
  • ultrafast optics


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