Giantly enhancing harmonic generations by a moiré superlattice nanocavity
We demonstrate that a moiré superlattice nanocavity constructed in a photonic crystal slab promises strongly enhanced nonlinear optics, which is beneficial from the high-quality factor and high coupling efficiency of the flat-band mode with zero group velocity. From a silicon moiré superlattice nanocavity integrated with few-layer gallium selenide (GaSe), the second-harmonic generation (SHG) of GaSe is enhanced by over 10,000 times, and the third-harmonic generation (THG) is enhanced by 8500 times. Our results suggest the moiré superlattice nanocavity could be considered as a promising platform for developing high-efficiency nonlinear photonic devices.
Authors
- Mingwen Zhang (ORCID: https://orcid.org/0000-0002-1989-4767)
- Xiaowen Wu (ORCID: https://orcid.org/0000-0002-5611-0626)
- Xuetao Gan (ORCID: https://orcid.org/0000-0003-2469-5807)
- Yanyan Zhang (ORCID: https://orcid.org/0000-0002-2048-145X)
- Yu Zhang (ORCID: https://orcid.org/0000-0002-5848-8892)
- Jie Wang (ORCID: https://orcid.org/0000-0001-6977-3253)
- Y. Ji (ORCID: https://orcid.org/0009-0003-9402-2250)
- Chenyang Zhao (ORCID: https://orcid.org/0009-0000-8305-401X)
- Liang Fang (ORCID: https://orcid.org/0000-0002-9665-9517)
- Jianlin Zhao (ORCID: https://orcid.org/0000-0002-4619-1215)
- Jianyu Wang (ORCID: https://orcid.org/0009-0000-3617-8562)
Institutions
- Northwestern Polytechnical University (CN)
- Ministry of Industry and Information Technology (CN)
Publication Details
- Journal
- Photonics Research
- Published
- 2025-05-30
- DOI
- https://doi.org/10.1364/prj.560853
- Citations
- 1
- Primary Topic
- Advanced Fiber Laser Technologies
- Type
- article
- Field-Weighted Citation Impact
- 1.25