InP纳米颗粒的超快动力学和光学非线性  

Transient Dynamics of Excited States and Nonlinear Optical Properties of InP Nanoparticles

作　　者：李丹[1] 杨合晴[2] 梁春军[1] 钱士雄[3] 

机构地区：[1]北京交通大学物理系,北京100044 [2]陕西师范大学化学与材料科学学院,陕西西安710062 [3]复旦大学物理系,上海200433

出　　处：《光谱学与光谱分析》2006年第9期1742-1745,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金(60406005;10374002)资助项目

摘　　要：通过飞秒泵浦-探测方法测量了波长为800nm时InP半导体纳米颗粒激发态的瞬态动力学过程。观察到一个快速的光致漂白建立和一个漂白的恢复过程,分析饱和吸收的来源可能是带填充效应引起跃迁的饱和吸收。对于漂白恢复中的快过程是由于自由载流子的弛豫,而慢成分是由于光激发载流子在很短的时间内受陷于表面态形成的限域载流子的弛豫。通过飞秒光克尔效应(OKE)方法测量材料的超快非线性响应曲线,计算了材料的光学三阶非线性极化率,分析了非线性的来源。The decay curves of the emission at different wavelength were measured. One nanosecond of transition lifetime of interband was obtained. The transient dynamics of InP nanoparticles was investigated by one color femtosecond pump-probe method at the wavelength of 800 nm. The experimental result shows that the saturation of exciton resonance results in photobleaching at 800 nm The decay process of the bleaching includes two components, i.c. the fast one from free carries scattering and the slow one from trapped carriers scattering. The nonlinear optical properties of InP nanoparticles were investigated by using femtosecond optical Kerr effect. The magnitude of x^3 for InP nanoparticles embedded in SiO2 sol-gel glass was calculated, and its origin was analyzed.

关 键 词：INP 纳米颗粒 飞秒 泵浦-探测 光学非线性 

分 类 号：O472.3[理学—半导体物理]