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  4. Megapixel time-gated SPAD image sensor for scientific imaging applications
 
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Megapixel time-gated SPAD image sensor for scientific imaging applications

Morimoto, Kazuhiro
•
Ardelean, Andrei
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Wu, Ming-Lo
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March 5, 2021
High-Speed Biomedical Imaging and Spectroscopy VI

We present a 1 megapixel single-photon avalanche diode (SPAD) camera featuring 3.8 ns time gating and 24 kfps frame rate for 1-bit images, fabricated in 180 nm CMOS image sensor technology. The SPAD sensor was used to capture 2D and 3D scenes over 2 m with depth resolution of 5.4 mm and precision better than 7.8 mm (rms). We demonstrate extended dynamic range in dual exposure operation mode and show spatially overlapped multi-object detection in single-photon time-gated time-of-flight experiments. We further demonstrate applications of the megapixel SPAD camera for fluorescence lifetime imaging microscopy (FLIM) and light-in-flight imaging.

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