Fast, flexible algorithm for calculating photon correlations

Ted A. Laurence, Samantha Fore, Thomas R Huser

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


We introduce a new algorithm for computing correlations of photon arrival time data acquired in single-molecule fluorescence spectroscopy and fluorescence correlation spectroscopy (FCS). The algorithm is based on rewriting the correlation as a counting operation on photon pairs and can be used with arbitrary bin widths and spacing. The flexibility of the algorithm is demonstrated by use of FCS simulations and single-molecule photon antibunching experiments. Execution speed is comparable to the commonly used multiple-tau correlation technique. Wide bin spacings are possible that allow for real-time software calculation of correlations, even for high count rates.

Original languageEnglish (US)
Pages (from-to)829-831
Number of pages3
JournalOptics Letters
Issue number6
StatePublished - Mar 15 2006

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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