The recent renaissances in the field of ferroelectric oxides are owing to various photoinduced phenomena. However, the microscopic correlations among various photoinduced physical characteristics are essential for a detailed understanding of the dynamics associated with these phenomena. In this work, the photoinduced dielectric, pyroelectric, and ferroelectric properties of a lead-free $\mathrm{B}{\mathrm{a}}_{0.875}{\left(\mathrm{B}{\mathrm{i}}_{0.5}\mathrm{L}{\mathrm{i}}_{0.5}\right)}_{0.125}\mathrm{Ti}{\mathrm{O}}_3$ ferroelectric oxide are carried out in out-of-plane and in-plane geometry. The dielectric studies under 405-nm light illumination revealed a significant change in dielectric permittivity along with a decrease in Curie temperature. The observed effects are attributed to the change in internal field distribution inflicted by the photogenerated nonequilibrium charge carriers and trapped charges. The sample exhibits a photoinduced significant change in pyroelectric current and the associated polarization. These effects demonstrate that light could be used as an additional degree of freedom to influence the ferroelectric order parameter. The observed photoinduced dielectric and ferroelectric characteristics give the experimental evidence for the theoretical formalism on the photoinduced ferroelectric phenomena. In addition, the Rayleigh analysis performed on this system highlights the strong correlation between the observed photoferroelectric characteristics with the Rayleigh parameters. These findings could widen the understanding of the photoferroelectric characteristics to extend its applications toward advanced optoelectronic devices.

中文翻译：

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铁电氧化物中的光铁电现象和瑞利分析

铁电氧化物领域的近来复兴归因于各种光致现象。但是，各种光诱导物理特性之间的微观关联对于详细了解与这些现象相关的动力学至关重要。在这项工作中，无铅的光致介电，热电和铁电特性$\mathrm{乙}{\mathrm{一种}}_{0.875}{（\mathrm{乙}{\mathrm{一世}}_{0.5}\mathrm{大号}{\mathrm{一世}}_{0.5}）}_{0.125}钛{\mathrm{Ø}}_3$铁电氧化物以平面外和平面内的几何形状进行。在405 nm光照下进行的介电研究表明，介电常数随居里温度的降低而发生了显着变化。观察到的效应归因于光生非平衡电荷载流子和俘获电荷造成的内部场分布的变化。样品在光电流和相关极化方面表现出光诱导的显着变化。这些效果表明，光可以用作影响铁电有序参数的附加自由度。观察到的光致介电和铁电特性为光致铁电现象的理论形式主义提供了实验证据。此外，在该系统上执行的瑞利分析突出了所观察到的光铁电特性与瑞利参数之间的强相关性。这些发现可以拓宽对光铁电特性的理解，从而将其应用扩展到先进的光电器件。