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Many aspects of life involve sensitive photodetection, which is now widely implemented in solid-state devices made from semiconductor materials due to their relatively low cost, high scalability, and better compatibility with the existing CMOS technology. State-of-the-art Geiger-mode avalanche detectors and the challenges they faced in single-photon detection efficiency and timing resolution are covered...
Increasing noise at high gain has limited the sensitivity of conventional 1550nm avalanche photoreceivers. We demonstrate an integrated avalanche detector with multiple gain and built-in feedback mechanisms which can potentially detect single photons.
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