Coherent Control of Colloidal Semiconductor Nanocrystals
Coherent Control of Colloidal Semiconductor Nanocrystals
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胶体半导体纳米晶体的相干控制
DOI：
10.1021/jp4010136
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发表时间：
2013
影响因子：
3.7
通讯作者：
T. Baumert
中科院分区：
文献类型：
--
作者：
M. Ruge;Roland Wilcken;M. Wollenhaupt;A. Horn;T. Baumert
在室温下，利用飞秒激光脉冲对胶体半导体纳米晶体中的双光子跃迁进行了弱场相干控制。用频域相位调制的超短红外激光脉冲辐照硫化镉（CdS）和硒化镉（CdSe）纳米粒子形成的胶体悬浮体。在成形脉冲的双光子激发（TPE）之后由电子-空穴复合产生的发光用作NC激发的量度。在实验中，我们采用了二阶（GDD）和三阶（TOD）的多项式谱相位函数以及相位跃变（θ阶跃），研究了不同形状的激光脉冲对两种纳米粒子激发的影响。鉴于在多标记双光子显微镜的潜在应用，这两种类型的NC均匀混合在一个单一的样品。我们发现，不同的脉冲形状使得该混合物中两种NC类型的激发之间具有选择性。数值模拟基础
Weak-field coherent control of a two-photon transition in colloidal semiconductor nanocrystals (NCs) by tailored femtosecond laser pulses is demonstrated at room temperature. Ensembles of cadmium sulfide (CdS) and cadmium selenide (CdSe) NCs forming a colloidal suspension were irradiated by ultrashort infrared laser pulses being phase-modulated in frequency domain. The luminescence generated by electron–hole recombination after two-photon excitation (TPE) of the shaped pulses serves as a measure for NC excitation. In the experiment, we applied polynomial spectral phase functions of second- (GDD) and third-order (TOD), as well as phase jumps (θ-step), and studied the effect of the various shaped laser pulses on the excitation of both types of NCs. In view of potential applications in multilabel two-photon microscopy, both types of NCs are uniformely mixed in a single sample. We find that distinct pulse shapes enable selectivity among the excitation of both NC types in this mixture. Numerical simulations ba...
影响因子：
3.4
作者：
M. Wollenhaupt;T. Baumert
通讯作者：
M. Wollenhaupt;T. Baumert