Periodically poled thin-film lithium niobate microring resonators with a second-harmonic generation efficiency of 250,000%/W
Periodically poled thin-film lithium niobate microring resonators with a second-harmonic generation efficiency of 250,000%/W
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DOI：
10.1364/optica.6.001455
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发表时间：
2019-12-20
期刊：
影响因子：
10.4
通讯作者：
Tang, Hong X.
中科院分区：
文献类型：
--
作者：
Lu, Juanjuan;Surya, Joshua B.;Tang, Hong X.
被许多人称为光子学中的硅的铌酸锂(LN)，自从被证明是超低损耗集成光子学平台以来，最近已经上升到芯片级非线性光学研究的前沿。由于其显著的二次非线性(CHI((2)，LN激发了许多重要的应用，如二次谐波产生(SHG)、自发参数下转换和光学参数振荡。在这里，我们展示了在双共振、周期极化的Z切LN微细加工中的高效率倍频，其中准相位匹配是通过场辅助区域工程实现的。同时，通过单滑轮波导优化基频和二次谐波的耦合条件，实现了双频工作。因此，当在1617 nm左右的低功率状态下泵浦周期性极化的LN微环时，实现了250,000%/W的片上倍频效率，这是目前集成光电子平台中报道的最先进的值。在低抽运功率115微瓦的情况下，获得了15%的绝对转换效率。这种周期性极化的LN微细也为其他腔增强型准相位匹配CHI((2))非线性光学过程提供了一个通用的平台。(C)OSA开放获取出版协议条款下的2019年美国光学学会
Lithium niobate (LN), dubbed by many as the silicon of photonics, has recently risen to the forefront of chip-scale nonlinear optics research since its demonstration as an ultralow-loss integrated photonics platform. Due to its significant quadratic nonlinearity (chi((2))), LN inspires many important applications such as second-harmonic generation (SHG), spontaneous parametric downconversion, and optical parametric oscillation. Here, we demonstrate high-efficiency SHG in dual-resonant, periodically poled z-cut LN microrings, where quasi-phase matching is realized by field-assisted domain engineering. Meanwhile, dual-band operation is accessed by optimizing the coupling conditions in fundamental and second-harmonic bands via a single pulley waveguide. As a result, when pumping a periodically poled LN microring in the low power regime at around 1617 nm, an on-chip SHG efficiency of 250,000%/W is achieved, a state-of-the-art value reported among current integrated photonics platforms. An absolute conversion efficiency of 15% is recorded with a low pump power of 115 mu W in the waveguide. Such periodically poled LN microrings also present a versatile platform for other cavity-enhanced quasi-phase-matched chi((2)) nonlinear optical processes. (c) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement