Boosted second-harmonic generation in the LiNbO$\mathrm{_3}$ metasurface governed by high-Q guided resonances and bound states in the continuum

@inproceedings{Zheng2022BoostedSG,
  title={Boosted second-harmonic generation in the LiNbO\$\mathrm\{\_3\}\$ metasurface governed by high-Q guided resonances and bound states in the continuum},
  author={Ze-yuan Zheng and Lei Xu and Lujun Huang and Daria A. Smirnova and Peilong Hong and Cuifeng Ying and Mohsen Rahman},
  year={2022}
}
To date, second-harmonic generation (SHG) at nanoscale has been concentrated on employing high-refractive-index nanostructures, owing to the strong field confinement at deep subwavelength scales based on optically resonant effects. However, low-index nanostructures generally exhibit weaker resonant effects and lower field confinement. To address this issue, by harnessing the large nonlinearity of LiNbO 3 , we propose a novel approach to employ guided resonances and bound states in the continuum (BICs… 

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