Space and time resolved coherent optical spectroscopy of single quantum dots
Space and time resolved coherent optical spectroscopy of single quantum dots
复制标题
单量子点的空间和时间分辨相干光谱
DOI：
10.1088/0268-1242/19/4/087
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发表时间：
2004
影响因子：
1.9
通讯作者：
T. Elsaesser
中科院分区：
文献类型：
--
作者：
T. Unold;K. Mueller;C. Lienau;T. Elsaesser
利用近场光学和飞秒抽运探测光谱相结合的实验技术，研究了单量子点在超快时间尺度上的相干非线性光学响应。利用该技术研究了强非共振光场对界面量子点中单激子光谱的影响。瞬态反射率光谱显示色散线的形状，反映了光诱导的量子点共振位移。非线性光谱由与光场相互作用期间获得的相干量子点偏振的相移控制。相移的测量和量子点偏振的超快控制被证明。
A novel experimental technique, combining near-field optics and femtosecond pump–probe spectroscopy, is demonstrated to analyse the coherent nonlinear optical response of single quantum dots on ultrafast time scales. The technique is used to study the effects of strong non-resonant light fields on the optical spectra of single excitons in interface quantum dots. Transient reflectivity spectra show dispersive line shapes reflecting the light-induced shift of the quantum dot resonance. The nonlinear spectra are governed by the phase shift of the coherent quantum dot polarization acquired during the interaction with the light field. The phase shift is measured and ultrafast control of the quantum dot polarization is demonstrated.