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<p>Microchannel plates are electron multipliers widely used in applications such as particle detection, imaging, or mass spectrometry and are often paired with a photocathode to enable photon detection. Conventional microchannel plates, made of glass fibers, face limitations in manufacturing flexibility and integration with electronic readouts. Hydrogenated amorphous silicon-based microchannel plates offer a compelling alternative and provide unique advantages in these areas. Here, we report on the characterization of the time resolution of amorphous silicon-based microchannel plates. Using high photoelectron flux and an amplifier, we measured a time resolution of (4.6&#xa0;±&#xa0;0.1) ps, while at lower fluxes, the arrival time uncertainty increased to (12.6&#xa0;±&#xa0;0.2) ps. By minimizing the distance between the detector and a low-noise amplifier, we achieved a time resolution of (6.1&#xa0;±&#xa0;0.2) ps even at low fluxes, demonstrating the exceptional timing capabilities of these detectors. Furthermore, we developed a new detector generation with funnel-shaped channel openings, increasing the active area to 95% and with simulated electron detection efficiency over 92%. Preliminary testing shows promising results, though challenges remain in single-particle detection. These findings highlight the potential of amorphous silicon-based microchannel plates for applications requiring high temporal resolution and detection efficiency.</p>

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Optimizing photon capture: advancements in amorphous silicon-based microchannel plates

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年4月7日

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  • Samira Frey,
  • Luca Antognini,
  • Jad Benserhir,
  • Emanuele Ripiccini,
  • Coenraad de Koning,
  • Andreas Riedo,
  • Mohamed Belhaj,
  • Claudio Bruschini,
  • Edoardo Charbon,
  • Christophe Ballif,
  • Nicolas Wyrsch

摘要

Microchannel plates are electron multipliers widely used in applications such as particle detection, imaging, or mass spectrometry and are often paired with a photocathode to enable photon detection. Conventional microchannel plates, made of glass fibers, face limitations in manufacturing flexibility and integration with electronic readouts. Hydrogenated amorphous silicon-based microchannel plates offer a compelling alternative and provide unique advantages in these areas. Here, we report on the characterization of the time resolution of amorphous silicon-based microchannel plates. Using high photoelectron flux and an amplifier, we measured a time resolution of (4.6 ± 0.1) ps, while at lower fluxes, the arrival time uncertainty increased to (12.6 ± 0.2) ps. By minimizing the distance between the detector and a low-noise amplifier, we achieved a time resolution of (6.1 ± 0.2) ps even at low fluxes, demonstrating the exceptional timing capabilities of these detectors. Furthermore, we developed a new detector generation with funnel-shaped channel openings, increasing the active area to 95% and with simulated electron detection efficiency over 92%. Preliminary testing shows promising results, though challenges remain in single-particle detection. These findings highlight the potential of amorphous silicon-based microchannel plates for applications requiring high temporal resolution and detection efficiency.