高阶效应下N型量子阱EIT介质中光孤子的存取  

Storage and Retrieval of Optical Soliton in N-Type Quantum Well EIT Medium Under High-Order Effects

作　　者：胡明君 王登龙 董耀勇 丁建文 Hu Mingjun;Wang Denglong;Dong Yaoyong;Ding Jianwen(School of Physics and Optoelectronics,Xiangtan University,Xiangtan 411105,Hunan,China;School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,Guangdong,China)

机构地区：[1]湘潭大学物理与光电工程学院,湖南湘潭411105 [2]广东工业大学机电工程学院,广东广州510006

出　　处：《光学学报》2023年第19期235-248,共14页Acta Optica Sinica

基　　金：国家自然科学基金(11832016)。

摘　　要：构建了由一束弱探测光和两束强控制光耦合到“三明治”型量子阱的能级之间形成N型四能级非对称双量子阱电磁诱导透明(EIT)介质模型,并研究了弱探测光在体系的线性吸收和非线性传播性质。结果表明,当两束控制光均开启后,体系的线性吸收特征曲线呈现出双EIT窗口。有趣的是,无论两束控制光的光强是否相等,所形成的双EIT窗口都呈对称分布。对于非线性情况,仅考虑低阶效应时体系所形成的光孤子并不能稳定地传播而是呈衰减状态;只有计及高阶效应时体系所形成的光孤子才能长距离稳定地传播,且光孤子可通过关闭和开启控制光进行存储和读取。同时还发现,体系所存取的光孤子幅度能通过控制光的光强进行调节。当保持第一控制光的光强不变时,所存取光孤子的幅度随着第二控制光光强的增大而增加;当保持第二控制光的光强不变时,所存取光孤子的幅度随着第一控制光光强的增大而降低。Objective As soliton can travel over long distance without attenuation and shape change due to the interplay balance between dispersion and nonlinearity in nonlinear media,it becomes a good information carrier in quantum information processing and transmission.Till now,the research on the storage and retrieval of optical soliton mainly focuses on ultracold atomic electromagnetic induction transparency(EIT)media.This is mainly because ultra-cold atomic systems can generate strong nonlinear effects under low light excitation.However,for practical applications,it is a great challenge to accurately control the optical soliton storage in the atomic EIT media due to the low temperature approaching to absolute zero and rarefaction.Fortunately,with the mature semiconductor quantum production technology,quantum wells have extensive application prospect in quantum information processing and transmission.Thus,we study the storage and retrieval of optical soliton in the GaAs/AlGaAs double quantum well EIT system.Methods Based on the current experiments,we first propose an N-type four-level asymmetrical semiconductor GaAs/AlGaAs double quantum well EIT model.Subsequently,the interaction properties between the optical field and semiconductor quantum wells in the system are studied by a semi-classical theory.The physical properties of the optical field are described by the Maxwell equation,while the semiconductor quantum well is described by the Bloch equation of quantum mechanics.Therefore,the Maxwell-Bloch(M-B)equations which govern the linear absorption and nonlinear propagating properties of the system are obtained.Generally,the analytic solution of the M-B equations cannot be obtained directly.Thereby,M-B equations are solved approximately by adopting a multiple-scale method.Correspondingly,the soliton solution[Eq.(63)]is chosen as the initial condition,and the M-B equations are numerically simulated by the Runge-Kutta method to explore the storage and retrieval of the probe pulse.Results and Discussions Through the above

关 键 词：非线性光学 光孤子的存储与读取 电磁诱导透明 半导体量子阱 

分 类 号：O431[机械工程—光学工程] O437[理学—光学]