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A CMOS Image Sensor With In-Pixel Two-Stage Charge Transfer for Fluorescence Lifetime Imaging

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3 Author(s)
Hyung-June Yoon ; Grad. Sch. of Electron. Sci. & Technol., Shizuoka Univ., Hamamatsu ; Itoh, S. ; Kawahito, Shoji

A CMOS image sensor for time-resolved fluorescence lifetime imaging with subnanosecond time resolution is presented. In order to analyze the fluorescence lifetime, the proposed CMOS image sensor has two charge transfer stages using a pinned photodiode structure in which the first charge transfer stage is for the time-resolved sifting of fluorescence in all the pixels simultaneously and the second charge transfer stage is for reading the signals in each pixel sequentially with correlated double sampling operation. A 0.18-mum CMOS image sensor technology with a pinned photodiode process option is used for the implementation of a 256 times 256 CMOS image sensor. The decaying images and lifetimes of fura-2 solutions having different concentrations are successfully measured with a 250-ps time step using the CMOS image sensor and ultraviolet laser diode as a light source.

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Electron Devices, IEEE Transactions on  (Volume:56 ,  Issue: 2 )