A 64x64 SPAD array for portable colorimetric sensing, fluorescence and x-ray imaging

Design and characterization of the designed test Single photon avalanche diode (SPAD) and the 64x64 pixel array based on the test SPAD. The test SPAD performances are compared to the state-of-the-art to prove the effectiveness of the design at low illumination condition. The 64x64 SPAD array performances are characterized and the results of three different applications (colorimetric sensing, fluorescence and x ray imaging) are reported.