Fluorescence correlation spectroscopy of finite-sized particles

Bin Wu, Yan Chen, Joachim D. Müller

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


A theory is presented to study fluorescence correlation spectroscopy for particles with size comparable to the beam waist of the observation volume. Analytical correlation curves are derived for some experimentally interesting particle geometries. It is found that the finiteness of the particle generally decreases the value of the correlation amplitude and increases the correlation time compared to a point particle model. Furthermore, not only the size but also the distribution of fluorophores affects the shape of the correlation function. This is experimentally demonstrated with surface and internally labeled fluorescent spheres. In addition, experiments are performed on fluorescent spheres of different radii to validate the model by comparing the results to theoretical predictions.

Original languageEnglish (US)
Pages (from-to)2800-2808
Number of pages9
JournalBiophysical journal
Issue number7
StatePublished - Apr 2008
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics


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