The advancement in material platforms exhibiting strong and robust electro-optic effects is crucial for further progress in developing highly efficient and miniaturized optoelectronic components with low power consumption for modern optical communication systems. In this work, we investigate thin-film lead zirconate titanate (PZT) substrates grown by a chemical solution deposition technique as a potential platform for on-chip plasmonic electro-optic modulators. A high modulation depth (>40 %) is achieved with 15 μm-long electro-optic directional coupler modulators. An unusual cutoff in the modulation frequency response at ∼200 kHz is observed and further studied with respect to possible reorientation effects. Second-harmonic generation signals are found influenced by the externally applied electric field, indicating that the domain reorientation effect can be responsible for the unusual frequency response observed.

中文翻译：

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锆钛酸铅平台上的等离激元电光调制器

表现出强大电光效应的材料平台的进步对于进一步开发现代光通信系统低功耗的高效、小型化光电元件至关重要。在这项工作中，我们研究了通过化学溶液沉积技术生长的薄膜锆钛酸铅（PZT）基板，作为片上等离子体电光调制器的潜在平台。使用 15 μm 长的电光定向耦合器调制器可实现高调制深度 (>40 %)。观察到调制频率响应在 ∼200 kHz 处的异常截止，并进一步研究了可能的重定向效应。发现二次谐波生成信号受到外部施加电场的影响，这表明域重定向效应可能是观察到的异常频率响应的原因。