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Nonlinear Lithium Niobate Metasurfaces for Second Harmonic Generation
Author(s) -
Ma Junjun,
Xie Fei,
Chen Weijin,
Chen Jiaxin,
Wu Wei,
Liu Wei,
Chen Yuntian,
Cai Wei,
Ren Mengxin,
Xu Jingjun
Publication year - 2021
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.202000521
Subject(s) - lithium niobate , second harmonic generation , materials science , optics , optoelectronics , nonlinear optics , sum frequency generation , laser , nonlinear system , second harmonic imaging microscopy , high harmonic generation , ultraviolet , energy conversion efficiency , physics , quantum mechanics
Abstract Second harmonic generation (SHG) is a coherent nonlinear phenomenon that plays an important role in laser color conversion. Lithium niobate (LN), which features both a large band gap and outstanding second‐order nonlinearities, acts as an important optical material for nonlinear frequency conversion covering a wide spectral range from ultraviolet to mid‐infrared. Here, LN metasurfaces with controllable SHG properties are experimentally demonstrated. Distinct enhancements for the SHG efficiency are observed at Mie‐resonances. And by changing the geometric parameters, thus the resonances of the metasurfaces, the authors manage to selectively boost the SHG efficiency at different wavelengths. The results would pave a way for developing with high flexibility the novel compact nonlinear light sources for applications such as biosensing and optical communications.