论文标题
巨大的第二谐波一代由荷兰锂膜上的界限连续腔启用
Giant second-harmonic generation enabled by bound-state continuum cavity on lithium niobate membra
论文作者
论文摘要
在本文中，我们提出和数值证明了第二次谐波生成的前向和向后传播的巨大增强，通过结合连续体中结合状态的高质量因子腔和优秀的硝基锂的非线性光学晶体。增强因子定义为由单独的烯甲酸酯膜产生的信号（niobate膜含有Si光栅）产生的第二个谐波信号的比率。此外，尽管蚀刻较少的氯酸酯膜的转化效率为4.77x10-6，但达到了350 ps的最小相互作用时间。增强功能的起源与有限差差时域（FDTD）模拟揭示的Fano样形状对称性模式（SPM）的激发有关。所提出的平台为与纳米光子设备兼容的新一代有效的集成光源开辟了道路，用于经典和量子应用。
In this paper, we proposed and numerically demonstrated a giant enhancement up to 108 in both forward and backward propagation of the Second Harmonic Generation by combining the high-quality factor cavities of the Bound States in the Continuum and the excellent nonlinear optical crystal of lithium niobate. The enhancement factor is defined as the ratio of the second harmonic signal generated by the structure (lithium niobate membrane with Si grating) divided by the signal generated by lithium niobate membrane alone. Furthermore, a minimum interaction time of 350 ps is achieved despite the etching less lithium niobate membrane with a conversion efficiency of 4.77x10-6. The origin of the enhancements is linked to the excitation of a Fano-like shape Symmetry-Protected Mode (SPM) that is revealed by Finite Difference Time Domain (FDTD) simulations. The proposed platform opens the way to a new generation of efficient integrated optical sources compatible with nanophotonic devices for classical and quantum applications.
