Quasi-Bound States in the Continuum Enhanced Second-Harmonic Generation in Thin-Film Lithium Niobate,Laser & Photonics Reviews

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Quasi-Bound States in the Continuum Enhanced Second-Harmonic Generation in Thin-Film Lithium Niobate
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2022-07-03 , DOI: 10.1002/lpor.202200031
Xiaotian Zhang ₁ , Linye He ₂ , Xin Gan ₂ , Xiaocong Huang ₂ , Yixuan Du ₁ , Zhenshan Zhai ₁ , Zhuang Li ₁ , Yuanlin Zheng ₃ , Xianfeng Chen ₃ , Yangjian Cai ₁ , Xianyu Ao ₁

Affiliation

This work reports the second-harmonic generation (SHG) in a z-cut thin-film lithium niobate (LN) under nearly normal-incident linearly-polarized pumping. To utilize the largest nonlinear term which is along the out-of-plane direction in the z-cut LN film, the film is patterned with a 2D periodic array to support symmetry-protected bound states in the continuum (BICs) bearing strong out-of-plane electric field component. Enabled by such optical resonances near the BIC condition at the pumping wavelength, significant enhancement in SHG compared to an unpatterned film is observed. This approach, combining transparent thin-film nonlinear materials with tailored BICs, offers prospects for engineering compact coherent light sources in a broad wavelength range.

中文翻译：

薄膜铌酸锂中连续谱中的准束缚态增强二次谐波

这项工作报告了在几乎正常入射线性极化泵浦下z切割薄膜铌酸锂 (LN)中的二次谐波产生 (SHG) 。为了利用z切割 LN 薄膜中沿面外方向的最大非线性项，薄膜采用 2D 周期阵列图案化，以支持连续介质 (BIC) 中的对称保护束缚态，具有强外平面外电场分量。通过在泵浦波长处 BIC 条件附近的这种光学共振，可以观察到与未图案化薄膜相比，SHG 的显着增强。这种方法将透明薄膜非线性材料与定制的 BIC 相结合，为在宽波长范围内设计紧凑型相干光源提供了前景。

更新日期：2022-07-03

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