铌酸锂
材料科学
二次谐波产生
光学
光电子学
薄膜
锂(药物)
铁电性
纳米技术
激光器
物理
电介质
医学
内分泌学
作者
Zengya Li,Zhuoran Hu,Xiaona Ye,Zhengyang Mao,Juan Feng,Hao Li,Shijie Liu,Bo Wang,Yuanlin Zheng,Xianfeng Chen
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-09-03
卷期号:24 (37): 11676-11682
标识
DOI:10.1021/acs.nanolett.4c03286
摘要
Second-order nonlinearity gives rise to many distinctive physical phenomena, e.g., second-harmonic generation, which play an important role in fundamental science and various applications. Lithium niobate, one of the most widely used nonlinear crystals, exhibits strong second-order nonlinear effects and electro-optic properties. However, its moderate refractive index and etching sidewall angle limit its capability in confining light into nanoscales, thereby restricting its application in nanophotonics. Here, we exploit nanocavities formed by second-order circular Bragg gratings, which support resonant anapole modes, to achieve a 42 000-fold enhanced second-harmonic generation in thin-film lithium niobate. The nanocavity exhibits a record-high normalized conversion efficiency of 1.21 × 10
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