De Lucia F, Huang D, Corbari C, Healy N, Sazio P J A
Opt Lett. 2014 Nov 15;39(22):6513-6. doi: 10.1364/OL.39.006513.
Conventional thermal poling methods require direct physical contact to internal fiber electrodes. Here, we report an indirect electrostatic induction technique using electrically floating wires inside the fiber combined with external electric fields that can allow for facile poling of complex microstructured fibers (MOFs) of arbitrarily long lengths. In combination with our unique ability to use liquid gallium electrodes, inducing second-order nonlinearities inside otherwise difficult to access multi-core or multi-hole MOFs now becomes entirely feasible and practical. The formation of a permanent second-order nonlinearity is unequivocally demonstrated by realizing quasi-phase-matched frequency doublers using periodic UV erasure methods in the induction-poled fibers. The second-order susceptibility created inside the fiber is driven by the potential difference established between the floating electrodes, which we calculate via numerical simulations.
传统的热极化方法需要与内部光纤电极进行直接物理接触。在此，我们报告一种间接静电感应技术，该技术利用光纤内部的电浮导线与外部电场相结合，可实现对任意长度的复杂微结构光纤（MOF）进行便捷极化。结合我们使用液态镓电极的独特能力，在原本难以触及的多芯或多孔MOF内部诱导二阶非线性现在变得完全可行且实用。通过在感应极化光纤中使用周期性紫外擦除方法实现准相位匹配倍频器，明确证明了永久二阶非线性的形成。光纤内部产生的二阶极化率由浮置电极之间建立的电位差驱动，我们通过数值模拟对其进行了计算。
