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research article

Wide-field fluorescence lifetime imaging of single molecules with a gated single-photon camera

Ronceray, Nathan  
•
Bennani, Salim
•
Mitsioni, Marianna Fanouria  
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December 1, 2025
Light: Science and Applications

Fluorescence lifetime imaging microscopy (FLIM) is a powerful tool to discriminate fluorescent molecules or probe their nanoscale environment. Traditionally, FLIM uses time-correlated single-photon counting (TCSPC), which is precise but intrinsically low-throughput due to its dependence on point detectors. Although time-gated cameras have demonstrated the potential for high-throughput FLIM in bright samples with dense labeling, their use in single-molecule microscopy has not been explored extensively. Here, we report fast and accurate single-molecule FLIM with a commercial time-gated single-photon camera. Our optimized acquisition scheme achieves single-molecule lifetime measurements with a precision only about three times less than TCSPC, while imaging with a large number of pixels (512 × 512) allowing for the spatial multiplexing of over 3000 molecules. With this approach, we demonstrate parallelized lifetime measurements of large numbers of labeled pore-forming proteins on supported lipid bilayers, and temporal single-molecule Förster resonance energy transfer measurements at 5-25 Hz. This method holds considerable promise for the advancement of multi-target single-molecule localization microscopy and biopolymer sequencing.

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10.1038_s41377-025-01901-2.pdf

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Main Document

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Published version

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openaccess

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CC BY

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1.33 MB

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Adobe PDF

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913925a2b988d31d01be98b6385b681b

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