Ning Shuya, Zhao Dingming, Zhang Naming, Wang Shuo, Xiao Yu, Zhang Jing, Zhang Fanghui
Opt Lett. 2024 Oct 15;49(20):5961-5964. doi: 10.1364/OL.540010.
High-performance and wavelength-tunable random lasing has a wide application prospect. We developed an enhanced-performance and wavelength-tunable magnetically controlled random lasing system based on R6G solution doped with FeO/Au nanoparticles (NPs), in which FeO/Au NPs could exhibit both magnetic and plasmonic characteristics. Compared to the FeO NPs, FeO/Au NPs could more effectively lower the random lasing threshold, which was 37.6% of that of the net gain medium. This is because the FeO/Au NPs exhibit the plasmonic effect and larger scattering cross section than the FeO NPs. In addition, the distribution of the FeO/Au NPs in the R6G solution could be effectively regulated by an external magnetic field; thus the random lasing emission modes could be tuned in real-time, and a switch between the random lasing and amplified spontaneous emission can be achieved by removing or applying the external magnetic field. This work provides a simple method to enhance the lasing properties and tune the emission wavelength simultaneously.
高性能且波长可调谐的随机激光具有广阔的应用前景。我们基于掺杂了FeO/Au纳米颗粒（NPs）的R6G溶液开发了一种性能增强且波长可调谐的磁控随机激光系统，其中FeO/Au NPs可同时展现磁性和等离子体特性。与FeO NPs相比，FeO/Au NPs能更有效地降低随机激光阈值，该阈值为纯增益介质阈值的37.6%。这是因为FeO/Au NPs展现出等离子体效应且散射截面比FeO NPs更大。此外，R6G溶液中FeO/Au NPs的分布可通过外部磁场有效调控；因此随机激光发射模式可实时调谐，并且通过移除或施加外部磁场可实现随机激光与放大自发辐射之间的切换。这项工作提供了一种同时增强激光特性和调谐发射波长的简单方法。
