Strongly nonexponential time-resolved fluorescence of quantum-dot ensembles in three-dimensional photonic crystals
Strongly nonexponential time-resolved fluorescence of quantum-dot ensembles in three-dimensional photonic crystals
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DOI：
10.1103/physrevb.75.115302
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发表时间：
2007-03-01
影响因子：
3.7
通讯作者：
Vos, Willem L.
中科院分区：
文献类型：
--
作者：
Nikolaev, Ivan S.;Lodahl, Peter;Vos, Willem L.
我们在实验上观察到三维光子晶体中的量子点系综显示出强烈的非指数时间分辨发射。这些复杂的发射衰减曲线与衰减率的连续分布进行了分析。对数正态分布描述了所有研究的晶格参数的衰减。分布宽度与量子点在晶胞中不同位置和偶极取向的辐射发射率的变化有关。我们发现一个惊人的六倍的变化的宽度的分布通过改变晶格参数。这种解释定性地同意的三维投影局域态密度的计算。因此，我们得出结论，量子点的合奏的荧光衰减是高度非指数的程度上，是由光子晶体控制。
We observe experimentally that ensembles of quantum dots in three-dimensional (3D) photonic crystals reveal strongly nonexponential time-resolved emission. These complex emission decay curves are analyzed with a continuous distribution of decay rates. The log-normal distribution describes the decays well for all studied lattice parameters. The distribution width is identified with variations of the radiative emission rates of quantum dots with various positions and dipole orientations in the unit cell. We find a striking sixfold change of the width of the distribution by varying the lattice parameter. This interpretation qualitatively agrees with the calculations of the 3D projected local density of states. We therefore conclude that fluorescence decay of ensembles of quantum dots is highly nonexponential to an extent that is controlled by photonic crystals.