A simple and effective approach based on the liquid phase exfoliation (LPE) method has been put forward for synthesizing boron quantum dots (BQDs). By adjusting the interactions between bulk boron and various solvents, the average diameter of produced BQDs is about 7 nm. The nonlinear absorption (NLA) responses of as-prepared BQDs have been systematically studied at 515 nm and 1030 nm. Experimental results prove that BQDs possess broadband saturable absorption (SA) and good third-order nonlinear optical susceptibility, which are comparable to graphene. The fast relaxation time and slow relaxation time of BQDs at 515 nm and 1030 nm are about 0.394–5.34 ps and 4.45–115 ps, respectively. The significant ultrafast nonlinear optical properties can be used in optical devices. Here, we successfully demonstrate all-optical diode application based on BQDs/ReS₂ tandem structure. The findings are essential for understanding the nonlinear optical properties in BQDs and open a new pathway for their applications in optical devices.

中文翻译：

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硼量子点的可扩展生产，可实现宽带超快非线性光学性能

提出了一种基于液相剥落（LPE）法的简单有效的合成硼量子点（BQDs）的方法。通过调节大块硼与各种溶剂之间的相互作用，生成的BQD的平均直径约为7 nm。制备的BQD的非线性吸收（NLA）响应已在515 nm和1030 nm进行了系统研究。实验结果证明，BQD具有与石墨烯相当的宽带饱和吸收（SA）和良好的三阶非线性光学磁化率。BQD在515 nm和1030 nm处的快速弛豫时间和缓慢弛豫时间分别约为0.394–5.34 ps和4.45–115 ps。显着的超快非线性光学特性可用于光学设备。这里，_2个串联结构。这些发现对于理解BQD中的非线性光学特性至关重要，并为其在光学设备中的应用开辟了一条新途径。