Multiparameter-dependent spontaneous emission in PbSe quantum dot-doped liquid-core multi-mode fiber
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A theoretical model was established in this paper to analyze the properties of 3.50 and 4.39 nm PbSe quantum dot-doped liquid-core multi-mode fiber. This model was applicable to both single- and multi-mode fiber. The three-level system-based light-propagation equations and rate equations were used to calculate the guided spontaneous emission spectra. Considering the multi-mode in the fiber, the normalized intensity distribution of transversal model was improved and simplified. The detailed calculating results were thus obtained and explained using the above-mentioned model. The redshift of the peak position and the evolution of the emission power were observed and analyzed considering the influence of the fiber length, fiber diameter, doping concentration, and the pump power. The redshift increased with the increases of fiber length, fiber diameter, and doping concentration. The optimal fiber length, fiber diameter, and doping concentration were analyzed and confirmed, and the related spontaneous emission power was obtained. Besides, the normalized emission intensity increased with the increase of pump power in a nearly linear way. The calculating results fitted well to the experimental data.
KeywordsPbSe Quantum dots Liquid-core Fiber
This work was financially supported by the National 863 Program (2011AA050509), the National Natural Science Foundation of China (61106039, 51272084, 61225018, and 11274142), the National Postdoctoral Foundation (2011049015), the Taishan Scholarship, the Hongkong Scholar Program (XJ2012022), the Shandong Natural Science Foundation (ZR2012FZ007), the Jilin Talent Fund, the Jilin Youth Foundation (201101025), and the State Key Laboratory on Integrated Optoelectronics (IOSKL2012ZZ12).