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Related Concept Videos

Difference from Background: Limit of Detection01:05

Difference from Background: Limit of Detection

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The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
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Dead-time effect on SPAD detection efficiency.

Yishai Albeck, Eran Greenberg, Talya Arusi-Parpar

    Applied Optics
    |August 12, 2025
    PubMed
    Summary

    Single-photon avalanche-diode detectors

    Area of Science:

    • Photon detection
    • Quantum optics
    • Semiconductor devices

    Background:

    • Geiger-mode single-photon detectors offer low-light detection capabilities.
    • Detector dead-time inherently limits the detection rate and overall efficiency.

    Purpose of the Study:

    • To investigate the impact of dead-time duration on the effective efficiency of single-photon avalanche-diode detectors.
    • To compare simulation results with experimental data for validation.
    • To analyze the dead-time dependence in both free-running and gated detection modes.

    Main Methods:

    • Experimental measurements of single-photon avalanche-diode detector performance.
    • Monte Carlo simulations to model detector behavior.
    • Derivation of analytical expressions to describe dead-time effects.

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    Main Results:

    • Effective efficiency is demonstrably sensitive to detector dead-time length.
    • Significant differences in dead-time dependence observed between free-running and gated modes.
    • Gated mode generally shows superior efficiency, with potential improvements at extended dead-times.
    • Free-running mode can rival gated mode efficiency under high background and long dead-time conditions.

    Conclusions:

    • Dead-time is a critical parameter influencing single-photon detector efficiency.
    • Operational mode (free-running vs. gated) significantly alters the dead-time's impact.
    • Gated mode offers advantages, but free-running mode provides signal timing independence, which can be beneficial.