Cui Jing, Yang Zhaohui, Zhang Yu, Fan Zhaoxuan, Wang Jianquan, Qin Xiaoyun, Gao Lijun, Yang Haoran, Liu Shuangliang, Zhou Liming, Fang Shaoming, Zhang Zhen
Key Laboratory of Surface & Interface Science of Henan Province, Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China.
Key Laboratory of Organic Integrated Circuit, Tianjin Key Laboratory of Molecular Optoelectronic Sciences & Ministry of Education, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China.
Nanomaterials (Basel). 2025 Jan 20;15(2):145. doi: 10.3390/nano15020145.
The exploitation of high-performance third-order nonlinear optical (NLO) materials that have a favorable optical limit (OL) threshold is essential due to a rise in the application of ultra-intense lasers. In this study, a Cu-based MOF (denoted as Cu-bpy) was synthesized, and its third-order NLO and OL properties were investigated using the Z-scan technique with the nanosecond laser pulse excitation set at 532 nm. The Cu-bpy exhibits a typical rate of reverse saturable absorption (RSA) with a third-order nonlinear absorption coefficient of 100 cm GW and a favorable OL threshold of 0.75 J cm (at a concentration of 1.6 mg mL), which is lower than that of most NLO materials that have been reported on so far. In addition, a DFT calculation was performed and was in agreement with our experimental results. Furthermore, the mechanism of the third-order NLO properties was illustrated as one-photon absorption (1PA). These results investigate the relationship between the structure and the nonlinear optical properties of Cu-bpy, and provide an experimental and theoretical basis for its use in optical limiting applications.
由于超强激光应用的增加，开发具有良好光学限幅（OL）阈值的高性能三阶非线性光学（NLO）材料至关重要。在本研究中，合成了一种铜基金属有机框架（记为Cu-bpy），并使用Z扫描技术在532 nm的纳秒激光脉冲激发下研究了其三阶NLO和OL特性。Cu-bpy表现出典型的反饱和吸收（RSA）速率，三阶非线性吸收系数为100 cm GW，在浓度为1.6 mg mL时具有0.75 J cm的良好OL阈值，该阈值低于迄今为止报道的大多数NLO材料。此外，进行了密度泛函理论（DFT）计算，结果与我们的实验结果一致。此外，三阶NLO特性的机制被阐明为单光子吸收（1PA）。这些结果研究了Cu-bpy的结构与非线性光学性质之间的关系，并为其在光学限幅应用中的使用提供了实验和理论基础。
