Boosting second harmonic generation by merging bound states in the continuum

被引：8
|
作者：
Liu, Qiang [1 ,2 ]
Qu, Lun [1 ,2 ]
Gu, Zhidong [1 ,2 ]
Zhang, Di [1 ,2 ]
Wu, Wei [1 ,2 ]
Cai, Wei [1 ,2 ]
Ren, Mengxin [1 ,2 ,3 ]
Xu, Jingjun [1 ,2 ]
机构：
[1] Nankai Univ, Sch Phys, Key Lab Weak Light Nonlinear Photon, Minist Educ, Tianjin 300071, Peoples R China
[2] Nankai Univ, TEDA Appl Phys Inst, Tianjin 300071, Peoples R China
[3] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Shanxi, Peoples R China
来源：
PHYSICAL REVIEW B | 2023年 / 107卷 / 24期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
LITHIUM-NIOBATE; ROBUST;
D O I：
10.1103/PhysRevB.107.245408
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ultracompact devices for second harmonic generation (SHG) have broad applications in various fields. In this study, we numerically demonstrate efficient SHG from a merged bound state in the continuum (BIC) based on a lithium niobate (LN) freestanding metasurface. Such merged BIC efficiently reduces the radiative loss and strongly enhances the quality factor (Q factor). We achieved 1% conversion efficiency under the 5 degrees incident angle with 2 kW/cm2 input intensity, which surpasses the performances of other nanostructures supported by traditional isolated BICs. Our work paves a promising way to enhance the interactions between light and matters at nanoscales, and provide a feasible idea in designing ultracompact SHG light sources.
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收藏
页数：6
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