Abstract
A fast, simple, and low-cost optical time-gating scheme for counting single photons is presented. Its construction consists of a silicon photodiode connected in series with a resistor and that operates in the photoconductive mode. The temporal resolution at the FWHM of the photon counting system was measured to be . The profile of a single-photon pulse measured with the counting system agreed well with analytical results. The system was also used to successfully resolve a pair of targets with separation inside a highly scattering medium by the use of time-gated early-arriving photons.
© 2011 Optical Society of America
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