微腔中量子点光子发射的动力学研究  

Dynamics of photon emission from a quantum dot in a microcavity

作　　者：李永乐[1] 郝智彪[1] 李政[1] 罗毅[1] 

机构地区：[1]清华大学电子工程系,清华信息科学与技术国家实验室(筹),北京100084

出　　处：《光电子．激光》2009年第12期1685-1689,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60536020;60723002);国家"973"计划资助项目(2006CB302800;2006CB921106)

摘　　要：基于量子回归理论建立了微腔-量子点耦合模型的主方程,研究了用激光脉冲激发时微腔中的量子点二能级系统的密度矩阵随时间的演化,然后通过密度矩阵得出发射光子数和二阶相关度等特性,并对适合于制作单光子源的微腔参数和泵浦条件进行了优化。相关参数中,微腔衰退率和系统耦合系数的相对关系对单光子发射过程起关键作用。The master equation for the microcavity-quantum dot coupled system is established based on the quantum regression theorem,and the time-dependent evolution of the density matrix of the two-level system for a quantum dot in a microcavity is studied under pumping by laser pulses.The characteristics such as the number of emitted photons and the second-order corelation function are derived from the density matrixes.Parameters of the microcavity and the pumping conditions are optimized for single-photon sources.The relativity between the microcavity decay rate and coupling coefficient is critical for single photon emission.

关 键 词：单光子源 微腔 量子点 

分 类 号：TN241[电子电信—物理电子学]