Abstract
Quasi-phase matching (QPM) enables flexible and efficient second-order nonlinearity ranging from bulk nonlinear crystals to integrated nonlinear photonic devices. Here, we propose a QPM nonlinear photonic device constructed using monolayer transition-metal dichalcogenide (TMDC) arrays attached on a silicon nitride waveguide. QPM second harmonic generation comes from a nonlinear interaction between evanescent fields of fundamental-frequency and second-harmonic guided modes with periodical monolayer TMDC arrays. Dispersions of the device can be tuned by changing the geometric parameters of the waveguide while the nonlinear overlap integral and the QPM condition can be controlled through the distribution of TMDC arrays. Our design provides a practical way to efficiently shape second-order nonlinearities in complementary metal–oxide–semiconductor-compatible photonic platforms.
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The custom code and the mathematical algorithm used to obtain the results within this paper are available from the corresponding authors upon reasonable request.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (11904424), the National Key R&D Program of China (2016YFA0301300), the Key-Area R&D Program of Guangdong Province (2018B030329001), and the Guangdong Special Support Program (2019JC05X397). We also like to thank Jin Liu and Zeyang Liao for useful discussions.
Funding
National Natural Science Foundation of China (11904424); National Key R&D Program of China (2016YFA0301300); Key-Area R&D Program of Guangdong Province (2018B030329001); the Guangdong Special Support Program (2019JC05X397).
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DZW conceived the idea. JCH performed the theoretical derivations and numerical simulations under the guidance of DZW and XHW. JCH and DZW wrote the manuscript. All authors read and approved the final manuscript.
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He, J., Wei, D. & Wang, X. Quasi-phase matching for a nonlinear photonic waveguide enabled by monolayer transition-metal dichalcogenide arrays. J. Korean Phys. Soc. 79, 380–385 (2021). https://doi.org/10.1007/s40042-021-00213-z
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DOI: https://doi.org/10.1007/s40042-021-00213-z