极化子效应对核壳量子点中光学克尔效应的影响  

Polaron Effect on the Optical Kerr Effect in a Core-shell Quantum Dot Quantum Well

作　　者：陈知红[1] 方天红[1] 

机构地区：[1]孝感学院物理与电子信息工程学院,湖北孝感432000

出　　处：《光子学报》2010年第4期630-633,共4页Acta Photonica Sinica

基　　金：湖北省孝感学院科学研究项目(Z2010008)资助

摘　　要：在有效质量近似下利用量子力学的密度矩阵理论,采用无限深势阱模型解三维薛定谔方程得到电子的本征能量和波函数.从理论上计算了考虑极化子效应后,在导带子带间跃迁时ZnS/CdSe柱型核壳结构量子点光学克尔效应的三阶极化率.通过数值计算,分析了电子-LO声子和电子-IO声子相互作用对ZnS/CdSe柱型核壳结构量子点光学克尔效应的三阶极化率的影响.结果表明:极化子效应对光学克尔效应的三阶极化率有很大影响,并且影响的大小与量子点的尺寸大小有关.The effect of the electron-phonon interaction on the Optical Kerr effect is investigated theoretically for electrons confined in a core-shell quantum dot. The interactions of electrons with different phonon modes in the core-shell system,including the confined longitudinal optical （LO） and the interface optical （IO） phonon modes, are investigated. It carried a detailed calculation of Optical Kerr effect on a ZnS/CdSe core-shell quantum dot as a function of pump photon energy ＇with different incident photon energy and under different sizes. The results reveal that the polaron effects are quite important especially around the peak value of the third-order susceptibility.

关 键 词：非线性光学 三阶极化率 极化子效应 光学克尔效应 

分 类 号：O437[机械工程—光学工程]