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Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera

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Reducing Afterpulsing in InGaAs(P) Single-Photon Detectors with Hybrid Quenching.

Junliang Liu^1,2, Yining Xu², Zheng Wang¹

¹School of Information Science and Engineering, Shandong University, 72 Binhai Road, Qingdao 266237, China.

Sensors (Basel, Switzerland)

|August 13, 2020

Summary

This study introduces a hybrid quenching technique for InP-based single-photon detectors, significantly reducing afterpulses. This innovation enhances detector performance for high-efficiency, free-running applications.

Keywords:

avalanche photodiodes quenching circuits single-photon avalanche diodes single-photon detectors

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Area of Science:

Photonics and Optoelectronics
Semiconductor Device Physics

Background:

Indium Phosphide (InP)-based single-photon avalanche diodes (SPADs) often exhibit a trade-off between high detection efficiency and high afterpulse probability.
Afterpulses, particularly higher-order ones, degrade the performance of SPADs in sensitive photon detection applications.

Discussion:

A novel hybrid quenching technique is proposed, integrating fast active quenching with high-frequency gated-passive quenching.
This method aims to suppress higher-order afterpulsing effects more effectively than traditional techniques.
The technique was evaluated on InP-based SPADs operating at 1.06 μm.

Key Insights:

The hybrid quenching method achieved a 10% to 85% reduction in afterpulses compared to the counter-based hold-off method.
This was demonstrated at a gate-free detection efficiency of 4% to 10% with a 40 ns dead time.
The results indicate a significant improvement in afterpulsing performance, especially for high-frequency gated SPADs.

Outlook:

The proposed hybrid quenching technique enables the use of high-frequency gated SPADs as high-performance free-running detectors.
This advancement is particularly beneficial for applications requiring high average detection efficiencies and wide gate widths.
Further research could explore optimizing the hybrid quenching parameters for various SPAD technologies and operating conditions.