Resonantly tunable second harmonic generation from lithium niobate metasurfaces
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 we experimentally demonstrate LN metasurfaces with controllable SHG properties. Distinct enhancements for the SHG efficiency are observed at Mie-resonances. And by changing the geometric parameters thus the resonances of the metasurfaces, we manage to selectively boost the SHG efficiency at different wavelengths. Our results would pave a way for developing with high flexibility the novel compact nonlinear light sources for applications, such as biosensing and optical communications.
Cite
@article{arxiv.2002.06594,
title = {Resonantly tunable second harmonic generation from lithium niobate metasurfaces},
author = {Junjun Ma and Fei Xie and Weijin Chen and Jiaxin Chen and Wei Wu and Wei Liu and Yuntian Chen and Wei Cai and Mengxin Ren and Jingjun Xu},
journal= {arXiv preprint arXiv:2002.06594},
year = {2020}
}
Comments
Corrected typos in Fig.2 and Fig.3. More analyses and data are given