期刊
NATURE PHOTONICS
卷 16, 期 9, 页码 644-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41566-022-01021-y
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资金
- Humboldt Research Fellowship from the Alexander von Humboldt Foundation
- Singapore National Research Foundation (NRF), Competitive Research Program, Prime Minister's Office, Singapore [NRF-CRP22-2019-0006]
- Ministry of Education (MOE), Singapore, under AcRF Tier 2 grant [MOE2019-T2-1-006]
- MOE, Singapore, under AcRF Tier 3 grant [MOE2018-T3-1-005]
- Singapore NRF
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC 2089/1-390776260]
- EPSRC Reactive Plasmonics Programme [EP/M013812/1]
In this study, ferroelectric NbOI2 nanosheets are shown to exhibit giant second-harmonic generation with conversion efficiencies that are orders of magnitude higher than commonly reported nonlinear crystals. The nonlinear response scales with layer thickness and is strain- and electrical-tunable.
Implementing nonlinear optical components in nanoscale photonic devices is challenged by phase-matching conditions requiring thicknesses in the order of hundreds of wavelengths, and is disadvantaged by the short optical interaction depth of nanometre-scale materials and weak photon-photon interactions. Here we report that ferroelectric NbOI2 nanosheets exhibit giant second-harmonic generation with conversion efficiencies that are orders of magnitude higher than commonly reported nonlinear crystals. The nonlinear response scales with layer thickness and is strain- and electrical-tunable; a record >0.2% absolute SHG conversion efficiency and an effective nonlinear susceptibility chi((2))(eff) in the order of 10(-9) m V-1 are demonstrated at an average pump intensity of 8 kW cm(-2). Due to the interplay between anisotropic polarization and excitonic resonance in NbOI2, the spatial profile of the polarized SHG response can be tuned by the excitation wavelength. Our results represent a new paradigm for ultrathin, efficient nonlinear optical components.
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