1 湘潭大学物理与光电工程学院, 湖南 湘潭 411105
2 铜仁学院物理与电子工程学院, 贵州 铜仁 554300
基于当前的实验条件, 在半导体量子点中考虑声子辅助跃迁效应去构建环形四能级半导体量子点电磁感应透明介质模型。利用多重尺度法解析地研究了其中的时间光孤子的动力学行为。结果发现, 可以通过调整声子辅助跃迁强度来控制时间光孤子的幅度、宽度和群速度等动力学性质。时间光孤子的群速度远小于光速, 且随着声子辅助跃迁强度的增加, 孤子的群速度不断减小, 以至于可能缓变接近于零从而出现停滞现象。光停滞有利于将光存储于量子器件内, 这为半导体量子器件实现光存储提供一定的参考价值。
量子光学 声子辅助跃迁 电磁感应透明 时间光孤子 半导体量子点 激光与光电子学进展
2017, 54(8): 082701
1 湘潭大学物理系, 湖南 湘潭 411105
2 铜仁学院物理与电子科学系, 贵州 铜仁 554300
构建一个由一束弱线性偏振探测光场在与其平行的磁场作用下形成的两正交偏振分量，联合两束强耦合控制光场与半导体单量子点相互作用所形成的四能级半导体量子点电磁感应透明介质模型，利用多重尺度法，解析地研究了该半导体量子点电磁感应透明介质中的两耦合时间矢量光孤子的稳定性及其碰撞特性。结果发现，该体系中两耦合时间矢量光孤子的碰撞特性与其初始相位差有关；当两孤子分量为同相或反相时，孤子间会呈现出近弹性碰撞且无能量转移；而当孤子分量间初始相位差为π 2 时，两孤子则会在融合之后再彼此分离且出现能量转移。
量子光学 半导体量子点 电磁感应透明 时间矢量光孤子
Author Affiliations
Abstract
Faculty of Physics and Optoelectronic Engineering, Institute for Nanophysics and Rare-Earth Luminescence, Xiangtan University, Xiangtan 411105, China
Li+-doped HoPO4 powders with a pure tetragonal phase are successfully synthesized by the co-precipitation method. It exhibits an obvious color change under sunlight and tri-phosphor fluorescent light illumination. The introduction of Li+ ions into HoPO4 can further enhance its photochromic property effectively. The doped Li+ ions induce changes in the crystal structure. The spectral characteristics and thus photochromic properties of HoPO4 are explored. The improved HoPO4 powder, when used as a photochromic material, has wide-ranging prospects in security, decoration, and other applications.
160.5690 Rare-earth-doped materials 300.1030 Absorption 330.1720 Color vision Chinese Optics Letters
2015, 13(3): 031601
Author Affiliations
Abstract
Ce3+/Er3+/Bi3+ triply-doped yttrium aluminum garnet (YAG) is synthesized using co-precipitation method. The Bi3+ concentration-dependent near-infrared (NIR) emission behavior is systemically investigated. The NIR emission of Er3+ ions at 1531 nm is enhanced threefold by the addition of 7 mol% Bi3+. Bi3+doping results in the formation of exciton in YAG and the variation in the local environment of the doped rare-earth ions. The enhancement in NIR luminescence is ascribed to the combined effects of the sensitization of exciton!Ce3+ !Er3+ and the Bi3+ doping-induced adjustment of the local environment for Ce3+ and Er3+ ions.
260.0260 Physical optics 260.2160 Energy transfer 260.3800 Luminescence Chinese Optics Letters
2013, 11(12): 122602
Author Affiliations
Abstract
The upconversion luminescences of YAlO3:Er3+ phosphor co-doping with different Gd3+ concentrations are investigated under the excitation of 980- and 532-nm diode lasers. A near ultraviolet upconversion emission at 410 nm is observed in YAlO3 under 532-nm excitation. Moreover, the inactive Gd3+ ions can improve the upconversion intensity efficiently in a certain range of concentration. Under 980-nm excitation, the visible upconversion emissions at 546 and 646 nm are enhanced by about 10 and 8 times at the Gd3+ concentration of 40%, respectively. The upconversion emission at 410 nm under 532-nm excitation is also enhanced by 7 times. The substitution of Gd3+ ions for Y3+ sites changes the local symmetry of Er3+, leading to the improvement of upconversion efficiency.
160.5690 Rare-earth-doped materials 160.4670 Optical materials 160.4760 Optical properties Chinese Optics Letters
2012, 10(8): 081602
Department of Physics, Xiangtan University, Hunan 411105, China
Chinese Journal of Lasers B
2002, 11(4): 286
