Quantum Dot Photon Statistics Measured by Three-Dimensional Particle Tracking

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 ∼ 20 μm2/s), we make the first measurements of photon...

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Bibliographic Details
Published in:Nano letters 2007-11, Vol.7 (11), p.3535-3539
Main Authors: McHale, Kevin, Berglund, Andrew J, Mabuchi, Hideo
Format: Article
Language:English
Subjects:
Applied sciences
Cadmium Compounds - chemistry
Cross-disciplinary physics: materials science
rheology
Diffusion
Electronics
Equipment Design
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Materials science
Mercaptoethanol - chemistry
Molecular electronics, nanoelectronics
Nanocrystalline materials
Nanoparticles - chemistry
Nanoscale materials and structures: fabrication and characterization
Nanotechnology - methods
Optics
Photon statistics and coherence theory
Photons
Physics
Probability
Quantum Dots
Quantum optics
Selenium Compounds - chemistry
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Sulfides - chemistry
Time Factors
Water - chemistry
Zinc Compounds - chemistry
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Summary: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 ∼ 20 μm2/s), we make the first measurements of photon antibunching (at ∼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.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl0723376