Simultaneous type-I and type-II phase matching for second-order nonlinearity in integrated lithium niobate waveguide
Simultaneous type-I and type-II phase matching for second-order nonlinearity in integrated lithium niobate waveguide
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DOI：
10.1364/oe.430438
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发表时间：
2021-08-02
期刊：
影响因子：
3.8
通讯作者：
Fan, Linran
中科院分区：
文献类型：
--
作者：
Briggs, Ian;Hou, Songyan;Fan, Linran
二阶光学非线性广泛应用于经典和量子光子学应用。由于材料色散和相位匹配的要求，光场的偏振在制造期间被预定义。通常仅满足一种类型的相位匹配条件，这限制了器件的灵活性。在这里，我们证明了相位匹配的类型I和类型II的二阶光学非线性可以同时实现在同一个波导薄膜锂的钛酸盐制成。这是通过设计几何色散来补偿材料色散和双折射来实现的。两个相位匹配条件的同时实现验证了二次谐波产生的偏振依赖性。相关光子也通过来自同一器件的参数下转换产生。该工作为利用柔性器件实现多功能光子学提供了一种新的途径。(C)根据OSA开放获取出版协议的条款，2021年美国光学学会
Second-order optical nonlinearity is widely used for both classical and quantum photonic applications. Due to material dispersion and phase matching requirements, the polarization of optical fields is pre-defined during the fabrication. Only one type of phase matching condition is normally satisfied, and this limits the device flexibility. Here, we demonstrate that phase matching for both type-I and type-II second-order optical nonlinearity can be realized simultaneously in the same waveguide fabricated from thin-film lithium niobate. This is achieved by engineering the geometry dispersion to compensate for the material dispersion and birefringence. The simultaneous realization of both phase matching conditions is verified by the polarization dependence of second-harmonic generation. Correlated photons are also generated through parametric down conversion from the same device. This work provides a novel approach to realize versatile photonic functions with flexible devices. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement