Quantum Optics Seminar by Serguei Okhonin – Niels Bohr Institute - University of Copenhagen

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Quantum Optics Seminar by Serguei Okhonin

Traditionally Avalanche Photodiodes (APDs) are used to improve the detector sensitivity and the operation frequency. By applying a high reverse bias voltage (typically 100-200 V in silicon), APDs show an internal current gain effect (around 100) due to impact ionization (avalanche effect). If very high gain is needed (105 to 106), certain APDs (single-photon avalanche diodes) can be operated with a reverse voltage above the APD's breakdown voltage (Geiger mode). This mode is particularly useful for single photon detection provided that the dark count event rate is sufficiently low.
We propose low voltage Photo Detectors (PD) having high internal gain.
Both linear and Geiger mode PDs will be described. Simulations and measurement results will be presented. Potential of these new devices for a single photon sensing will be discussed.