title: Time-gating scheme based on a photodiode for single-photon counting.
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 50 Ω resistor and that operates in the photoconductive mode. The temporal resolution at the FWHM of the photon counting system was measured to be 62 ps. 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 4 mm separation inside a highly scattering medium by the use of time-gated early-arriving photons.
authors: University of Connecticut, Electrical and Computer Engineering Department, 371 Fairfield Way, Unit 2157, Storrs, Connecticut 06269, USA. dzify@engr.uconn.edu
authors: Patrick D
authors: PD
authors: Kumavor
authors: Behnoosh
authors: B
authors: Tavakoli
authors: Eric
authors: E
authors: Donkor
authors: Quing
authors: Q
authors: Zhu
mesh_terms: D004553:Electric Conductivity; D008027:Light; D017785:Photons; D012542:Scattering, Radiation; D013997:Time Factors