Submicrometer periodic poling of lithium niobate thin films with bipolar preconditioning pulses
Submicrometer periodic poling of lithium niobate thin films with bipolar preconditioning pulses
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DOI：
10.1364/ome.394724
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发表时间：
2020-08
影响因子：
2.8
通讯作者：
J. Nagy;R. Reano
中科院分区：
文献类型：
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作者：
J. Nagy;R. Reano
具有亚微米周期的周期极化二阶非线性材料对于发展准相位匹配返波非线性光学过程具有重要意义。涉及反向传播波的相互作用表现出许多独特的性质，并使设备，如后向二次谐波发生器，无镜光学参量振荡器和窄带量子纠缠光子源。然而，由于横向畴扩展和合并，在铁电锂中制造致密的铁电畴光栅仍然具有挑战性。在这里，我们报告了离子切片x切割氧化镁掺杂锂离子电池薄膜的亚微米周期性极化。使用多个双极预处理脉冲进行电场极化，可提高极化产率和畴均匀性。内部场被发现与每个预处理极化周期减少。极化域的特征在于由piezoresponse力显微镜。基本周期为747 nm。
Periodically poled second-order nonlinear materials with submicrometer periods are important for the development of quasi-phase matched backward-wave nonlinear optical processes. Interactions involving counter-propagating waves exhibit many unique properties and enable devices such as backward second harmonic generators, mirrorless optical parametric oscillators, and narrow-band quantum entangled photon sources. Fabrication of dense ferroelectric domain gratings in lithium niobate remains challenging, however, due to lateral domain spreading and merging. Here, we report submicrometer periodic poling of ion-sliced x-cut magnesium oxide doped lithium niobate thin films. Electric-field poling is performed using multiple bipolar preconditioning pulses that improve the poling yield and domain uniformity. The internal field is found to decrease with each preconditioning poling cycle. The poled domains are characterized by piezoresponse force microscopy. A fundamental period of 747 nm is achieved.