Ultrahigh-efficiency wavelength conversion in nanophotonic periodically poled lithium niobate waveguides
Ultrahigh-efficiency wavelength conversion in nanophotonic periodically poled lithium niobate waveguides
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DOI：
10.1364/optica.5.001438
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发表时间：
2018-11-20
期刊：
影响因子：
10.4
通讯作者：
Loncar, Marko
中科院分区：
文献类型：
--
作者：
Wang, Cheng;Langrock, Carsten;Loncar, Marko
定期螺旋的氯酸锂（PPLN）波导是有效波长转换的强大平台。但是，由于非线性相互作用强度有限，常规的PPLN转换器通常需要长的设备长度和高泵功率。在这里，我们使用纳米结构的PPLN波导来证明第二次谐波生成1.5 mu M辐射的超高归一化效率为2600％/w-cm（2），比最新的散布中的效率高20倍以上。波导。这是通过在4 mu m的一阶波动期间的亚波长光学限制和高保真周期性极点的组合来实现的。我们高度集成的PPLN波导对于经典和量子光子系统的将来的芯片尺度整合是有希望的。 （c）2018年美国光学学会根据OSA开放访问出版协议的条款
Periodically poled lithium niobate (PPLN) waveguides are a powerful platform for efficient wavelength conversion. Conventional PPLN converters, however, typically require long device lengths and high pump powers due to the limited nonlinear interaction strength. Here we use a nanostructured PPLN waveguide to demonstrate an ultrahigh normalized efficiency of 2600%/W-cm(2) for second-harmonic generation of 1.5 mu m radiation, more than 20 times higher than that in state-of-the-art diffused waveguides. This is achieved by a combination of sub-wavelength optical confinement and high-fidelity periodic poling at a first-order poling period of 4 mu m. Our highly integrated PPLN waveguides are promising for future chip-scale integration of classical and quantum photonic systems. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement