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arXiv 0901.4425physics.opticsphysics.data-an
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从系综荧光光谱中的强度相关揭示单发射体光谱动力学

Revealing single emitter spectral dynamics from intensity correlations in an ensemble fluorescence spectrum

Xavier Brokmann, Lisa Marshall, Moungi Bawendi

摘要:

我们发现,单发射线宽下的一个加宽的合奏发射光谱可以提取的合奏光谱中的随机强度波动之间的相关性。在扫描迈克耳孙干涉仪的输出端放置一对互相关的雪崩光电二极管,可以在高的时间和光谱分辨率下观察到光谱相关性。如与模拟结合荧光相关光谱所示,我们的方法克服了合奏和时间不均匀加宽,以提供单发射器线宽,即使在弱,连续,宽带激发下的发射器。

英文摘要:

We show that the single emitter linewidth underlying a broadened ensemble emission spectrum can be extracted from correlations among the stochastic intensity fluctuations in the ensemble spectrum. Spectral correlations can be observed at high temporal and spectral resolutions with a cross-correlated pair of avalanche photodiodes placed at the outputs of a scanning Michelson interferometer. As illustrated with simulations in conjunction with Fluorescence Correlation Spectroscopy, our approach overcomes ensemble and temporal inhomogeneous broadening to provide single emitter linewidths, even for emitters under weak, continuous, broadband excitation.

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