Quantum dot photon statistics measured by three-dimensional particle tracking

被引：0
|
作者：
McHale, Kevin [1 ]
Berglund, Andrew J. [1 ]
Mabuchi, Hideo [1 ]
机构：
[1] CALTECH, Pasadena, CA 91125 USA
来源：
NANO LETTERS | 2007年 / 7卷 / 11期
关键词：
D O I：
10.1021/nl0723376
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We present an instrument for performing correlation spectroscopy on single fluorescent particles while tracking their Brownian motion in three dimensions using real-time feedback. By tracking CdSe/ZnS quantum dots in water (diffusion coefficient similar to 20 mu m(2)/s), we make the first measurements of photon antibunching (at similar to 10 ns) on single fluorophores free in solution and find fluorescence lifetime heterogeneity within a quantum dot sample. In addition, we show that 2-mercaptoethanol suppresses short time-scale intermittency (1 ms to 1 s) in quantum dot fluorescence by reducing time spent in the off-state.
引用
收藏
页码：3535 / 3539
页数：5
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