计及激子-双激子相干下半导体单量子点中的空间光孤子对  

Spatial optical soliton pairs in a quantum dot with exciton-biexciton coherence

作　　者：曾宽宏[1] 王登龙[1] 佘彦超 张蔚曦[2] 

机构地区：[1]湘潭大学物理系,湘潭411105 [2]铜仁学院物理与电子科学系,铜仁554300

出　　处：《物理学报》2013年第14期460-466,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51032002);湖南省教育厅研究基金(批准号:12A140);贵州省科技厅科学技术基金(批准号:J20112219;J20122314)资助的课题~~

摘　　要：考虑激子-双激子的相干效应,解析地研究了半导体单量子点中探测光和信号光的吸收特性和非线性传播特性.结果发现,在线性条件下,单量子点中出现电磁感应透明现象;进一步分析可得,电磁感应透明所呈现的是单窗口或双窗口或光学增益均可通过调节控制光强加以控制.在非线性条件下,弱信号光诱导弱探测光产生两个分量,这两个分量在系统中所激发的自克尔和交叉克尔非线性效应与系统的衍射效应相平衡从而形成稳定的亮-亮,亮-暗,暗-暗等空间光孤子对.Considering the exciton-biexciton coherence, we analytically study the linear absorption and nonlinear propagation properties of the probe and signal field in a semiconductor quantum dot. It is found that in the linear case, in the system takes place an electromag- netically induced transparency phenomenon. Furthermore, we obtain that in the system there occurs one- or two-transparency window, or optical gain, which is controlled by adjusting the coupling control field. For the nonlinear case, the weak probe field, which is induced by a signal field, splits into two parts. When their excited self-Kerr and cross-Kerr nonlinear effects balance the refractive effect of the beam, the system exhibits bright-bright, bright-dark, dark-bright, dark-dark soliton pairs.

关 键 词：半导体量子点 电磁感应透明 空间光孤子对 

分 类 号：O431.2[机械工程—光学工程]