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    Area of Science:

    • Photonics
    • Semiconductor Devices
    • Quantum Optics

    Background:

    • After-pulsing is a significant challenge in high-speed, low-noise single-photon detection using single-photon avalanche diodes (SPADs).
    • Existing SPAD systems struggle with discriminating weak avalanche signals from parasitic responses.

    Purpose of the Study:

    • To present a novel dual anode InGaAs/InP SPAD (DA-SPAD) for improved single-photon detection.
    • To demonstrate the DA-SPAD's capability in detecting weak avalanche signals and reducing after-pulsing.

    Main Methods:

    • Developed a dual anode SPAD (DA-SPAD) with two separate anode output ports.
    • Employed a simple subtraction circuit to discriminate weak avalanche signals.
    • Investigated the gated Geiger-mode performance of the DA-SPAD.

    Main Results:

    • Weak avalanche signals, below the parasitic capacitive response, were successfully detected using the DA-SPAD and subtraction circuit.
    • At 1 GHz gating frequency and -20 °C, the DA-SPAD achieved 20.4% detection efficiency.
    • The DA-SPAD exhibited an after-pulse probability of 3.5% under tested conditions.

    Conclusions:

    • The DA-SPAD offers a simple and robust solution for single-photon detection systems.
    • This design effectively mitigates the after-pulsing effect, enhancing detection accuracy.
    • The DA-SPAD shows promising performance for high-speed, low-noise photon detection applications.