Phase Engineering of Giant Second Harmonic Generation in Bi<sub>2</sub>O<sub>2</sub>Se
2D materials with remarkable second-harmonic generation (SHG) hold promise for future on-chip nonlinear optics. Relevant materials with both giant SHG response and environmental stability are long-sought targets. Here, the enormous SHG from the phase engineering of a high-performance semiconductor, Bi<sub>2</sub>O<sub>2</sub>Se (BOS), under uniaxial strain, is demonstrated. SHG signals captured in strained 20 nm-BOS films exceed those of NbOI<sub>2</sub> and NbOCl<sub>2</sub> of similar thickness by a factor of 10, and are four orders of magnitude higher than monolayer-MoS<sub>2</sub>, resulting in a significant second-order nonlinear susceptibility on the order of 1 nm V<sup>-1</sup>. Intriguingly, the strain enables continuous adjustment of the ferroelectric phase transition across room temperature. An exceptionally large tunability of SHG, approximately six orders of magnitude, is achieved through strain modulation. This colossal SHG, originating from the geometric phase of Bloch wave functions and coupled with sensitive strain tunability in this air-stable 2D semiconductor, opens new possibilities for designing chip-scale, switchable nonlinear optical devices.
Authors
- Ziye Zhu (ORCID: https://orcid.org/0000-0002-2758-9615)
- Shuigang Xu (ORCID: https://orcid.org/0000-0002-0589-5291)
- Zhefeng Lou (ORCID: https://orcid.org/0000-0001-6764-0318)
- Xiaorui Zheng (ORCID: https://orcid.org/0000-0002-6672-1092)
- Mengqi Wu (ORCID: https://orcid.org/0000-0001-9403-1745)
- Zhihao Gong
- Wei Kong (ORCID: https://orcid.org/0000-0002-7965-4407)
- Tao Wang (ORCID: https://orcid.org/0000-0003-3271-3331)
- Lan Li (ORCID: https://orcid.org/0000-0002-9097-9157)
- Hua Wang (ORCID: https://orcid.org/0000-0002-8490-2874)
- Zhiwei Wang (ORCID: https://orcid.org/0000-0003-0182-2471)
- Wenbin Li (ORCID: https://orcid.org/0000-0002-1240-2707)
- Jialu Wang (ORCID: https://orcid.org/0000-0002-0927-9242)
- Xiao Lin (ORCID: https://orcid.org/0000-0002-1773-1761)
- Yingjie Zhao (ORCID: https://orcid.org/0000-0002-2668-3722)
- Zhuokai Xu
- Haoyu Qi
- Huakun Zuo
- Jichuang Shen
Institutions
- Beijing Institute of Technology (CN)
- Tianjin Normal University (CN)
- Hangzhou Normal University (CN)
- Westlake University (CN)
- Wuhan National Laboratory for Optoelectronics (CN)
- Huazhong University of Science and Technology (CN)
- Zhejiang University (CN)
Publication Details
- Journal
- Advanced Materials
- Published
- 2024-12-04
- DOI
- https://doi.org/10.1002/adma.202409887
- Citations
- 3
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.35
Funders
- National Natural Science Foundation of China
- Science Fund for Distinguished Young Scholars of Zhejiang Province