Ye Lihua, Cheng Zhixiang, Zhang Ziang, Hong Shaoqiang, Zhao Qing
Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, People's Republic of China.
Nanotechnology. 2024 Oct 4;35(50). doi: 10.1088/1361-6528/ad7e33.
We experimentally demonstrate the coherent random laser emission by combining CdSe/ZnS colloidal quantum dots with hollow optical fiber. Through the localized surface plasmon resonance induced by Ag nanoparticles (NPs), well-distinguished discrete spikes are observed from the Ag modified hollow fiber loaded with CdSe/ZnS QDs solution. In addition, coherent random laser action with low threshold is also realized in the hollow optical fiber filled with high packing-density CdSe/ZnS QDs even if the Ag NPs is not introduced. The self-assembled clusters of CdSe/ZnS QDs serve as the optical gain media as well as the strong scattering centers. The angle measurement experiments show that the directional emission of random laser can be adjusted by using different pumping manners. This facile, inexpensive, low pump threshold random laser could be widely used in photonic devices and display imaging.
我们通过将CdSe/ZnS胶体量子点与空心光纤相结合，实验证明了相干随机激光发射。通过银纳米颗粒（NPs）诱导的局域表面等离子体共振，在负载有CdSe/ZnS量子点溶液的银修饰空心光纤中观察到了清晰分辨的离散尖峰。此外，即使不引入银纳米颗粒，在填充有高堆积密度CdSe/ZnS量子点的空心光纤中也实现了低阈值的相干随机激光作用。CdSe/ZnS量子点的自组装团簇既作为光学增益介质，又作为强散射中心。角度测量实验表明，随机激光的定向发射可以通过使用不同的泵浦方式来调节。这种简便、廉价、低泵浦阈值的随机激光可广泛应用于光子器件和显示成像。
