近红外PbS量子点掺杂光子晶体光纤的光传输特性  

Optical Transmission Performance of Photonic Crystal Fiber Doped with Near-Infrared PbS Quantum Dots

作　　者：程成[1] 沈承昱 Cheng Cheng;Shen Chengyu(Institute of Intelligent Optoelectronic Technology, Zhejiang University of Technology,Hangzhou, Zhejiang 310023, China)

机构地区：[1]浙江工业大学光电子智能化技术研究所

出　　处：《光学学报》2019年第5期94-101,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61274124,61474100)

摘　　要：制备了导光波带位于近红外1400~1650nm的硫化铅(PbS)量子点掺杂光子晶体光纤(QD-PCF)。测量了QD-PCF对980nm抽运光和1550nm信号光的吸收。在980nm激光激励下,测量了QD-PCF的光致荧光(PL)光谱,确定了1550nm中心波长处PL光强最强时的量子点掺杂浓度(质量分数)和光纤长度,发现其PL光强远大于普通单纤芯掺杂的量子点光纤(QDF)。实验发现QD-PCF的PL光强会出现间隔距离较短的多光强峰值,该多光强峰值现象与掺杂浓度有关。对比测量了QD-PCF和未掺杂PCF的带隙,表明量子点掺杂没有改变PCF的带隙分布。测量了QD-PCF的抽运激励阈值和抽运饱和功率,其抽运阈值功率与QDF接近,抽运饱和功率大于QDF,这与QD-PCF有较大的光纤截面以及较高的量子点掺杂浓度有关。We fabricated a PbS quantum-dot-doped photonic crystal fiber (QD-PCF) working in the near-infrared range of 1400-1650 nm and measured its absorption of 980 nm pump light and 1550 nm signal light. Upon the excitation of 980 nm pump light, we acquired the photoluminescence (PL) spectrum of the QD-PCF and determined the doping concentration (mass fraction) and fiber length that maximized the PL intensity at the central wavelength of 1550 nm. The PL intensity of the QD-PCF far exceeded that of the usual single-core quantum-dot-doped fiber (QDF), appearing multiple intensity peaks spacing a short distance. The intensities of these peaks were related to the doping concentration. Comparing the QD-PCF with the un-doped PCF, the bandgap was not found to be changed by quantum-dot doping. The threshold and saturated pump powers of the QD-PCF were also measured. The threshold pump power approximated that of the QDF, but the saturated pump power exceeded that of the QDF, owing to the larger fiber section and higher doping concentration in the QD-PCF.

关 键 词：光纤光学 光子晶体光纤 量子点掺杂 带隙 光致荧光 吸收 阈值 

分 类 号：TN253[电子电信—物理电子学]