The Bi₂Se₃ family can exhibit many intriguing topological insulator properties, including a narrow bandgap and strong surface states, which show excellent nonlinear optical properties. Thinning bulk Bi₂Se₃ family materials to create a low-cost photoelectric modulation device and explaining the mechanisms of nonlinear optical differences in different types of materials remain challenges. Based on liquid-phase exfoliation technology and tapered fiber, this work prepared optoelectronic modulation devices for various samples within the Bi₂Se₃ family, quantitatively compared their nonlinear optical properties, and analyzed the sources of differentiation using the occupied and unoccupied multiband structure theory. The results correspond well to the phenomena observed in the ultrafast laser, which will provide strong support for the design of higher performance photoelectric devices based on topological insulators.

中文翻译：

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拓扑材料 Bi2Se3 族的非线性光学特性在基于占用和未占用能带结构的超快脉冲激光器中的应用


Bi₂Se₃ 系列可以表现出许多有趣的拓扑绝缘体特性，包括窄带隙和强表面态，它们表现出优异的非线性光学特性。减薄块体 Bi₂Se₃ 系列材料以创建低成本的光电调制器件并解释不同类型材料中非线性光学差异的机制仍然是挑战。基于液相剥离技术和锥形纤维，本研究制备了用于 Bi₂Se₃ 家族中各种样品的光电调制器件，定量比较了它们的非线性光学性质，并使用占据和未占据多带结构理论分析了分化来源。结果与在超快激光器中观察到的现象非常吻合，这将为基于拓扑绝缘体的高性能光电器件的设计提供有力支持。