Wide-field time-correlated single-photon counting (TCSPC) lifetime microscopy with microsecond time resolution

Liisa M. Hirvonen, Frederic Festy, Klaus Suhling

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


A 1 MHz frame rate complementary metal-oxide semiconductor (CMOS) camera was used in combination with an image intensifier for wide-field time-correlated single-photon counting (TCSPC) imaging. The system combines an ultrafast frame rate with single-photon sensitivity and was employed on a fluorescence microscope to image decays of ruthenium compound Ru(dpp) with lifetimes from around 1 to 5 μs. A submicrowatt excitation power over the whole field of view is sufficient for this approach, and compatibility with live-cell imaging was demonstrated by imaging europium-containing beads with a lifetime of 570 μs in living HeLa cells. A standard two-photon excitation scanning fluorescence lifetime imaging (FLIM) systemwas used to independently verify the lifetime for the europium beads. This approach brings together advantageous features for time-resolved live-cell imaging such as low excitation intensity, single-photon sensitivity, ultrafast camera frame rates, and short acquisition times.

Original languageEnglish
Pages (from-to)5602-5605
Number of pages4
JournalOptics Letters
Issue number19
Publication statusPublished - 1 Oct 2014
Externally publishedYes


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