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Time-gating scheme based on a photodiode for single-photon counting.

Patrick D Kumavor1, Behnoosh Tavakoli, Eric Donkor

  • 1University of Connecticut, Electrical and Computer Engineering Department, 371 Fairfield Way, Unit 2157, Storrs, Connecticut 06269, USA. dzify@engr.uconn.edu

Optics Letters
|July 5, 2011
PubMed
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We developed a low-cost optical time-gating system for single-photon counting. This system achieves 62 ps temporal resolution and successfully resolved targets in scattering media.

Area of Science:

  • Photonics
  • Optical Physics
  • Instrumentation

Background:

  • Accurate single-photon counting is crucial for various scientific applications.
  • Existing methods can be complex or expensive.
  • There is a need for simpler, cost-effective photon detection solutions.

Purpose of the Study:

  • To present a novel, fast, simple, and low-cost optical time-gating scheme for single-photon counting.
  • To characterize the temporal resolution and performance of the developed system.
  • To demonstrate the system's capability in resolving objects within scattering media.

Main Methods:

  • The system utilizes a silicon photodiode operating in photoconductive mode, connected in series with a 50 Ω resistor.
  • Time-gating is achieved through the inherent response characteristics of the photodiode circuit.

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  • Temporal resolution was measured using the full width at half maximum (FWHM) of the single-photon pulse response.

    • Main Results:

    • The optical time-gating system demonstrated a temporal resolution of 62 ps (FWHM).
    • Measured single-photon pulse profiles closely matched analytical predictions.
    • The system successfully resolved two targets separated by 4 mm within a highly scattering medium using early-arriving photons.

    Conclusions:

    • The presented optical time-gating scheme offers a fast, simple, and economical approach for single-photon counting.
    • The system's high temporal resolution and ability to function in scattering media open possibilities for advanced optical measurements.
    • This technology can be valuable for applications requiring precise timing and detection of single photons.