Ultrasensitive Sub-Nanosecond Time-Gated Detection Using a Single Photon Avalanche Diode

  • Lloyd M. Davis
  • Li-Qiang Li


Ultrasensitive detection and spectroscopy experiments require single photon detectors with sub-nanosecond timing jitter. Since the first experiments demonstrating the detection of single chromophore dye molecules in solution,1 a significant improvement in the signal rate from each molecule has been achieved by using a high quantum efficiency single photon avalanche diode (SPAD). The EG&G SPCM-200 SPAD with custom-modified passivelyquenched bias circuit has been characterized for this purpose2 and has been found to provide a quantum efficiency of 55% at 532 nm and a single photon timing jitter of 168 ps when the input light is focused to a spot of diameter < 20 µm.


Dead Time Time Spectrum Single Photon Detector Single Molecule Detection Fluorescence Photon 
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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • Lloyd M. Davis
    • 1
  • Li-Qiang Li
    • 1
  1. 1.Center for Laser ApplicationsUniversity of Tennessee Space InstituteTullahoma

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