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Semiconductor Optical Single-Photon Diode

Semiconductor Optical Single-Photon Diode. Jie Zhang Department of Electrical and Computer Engineering. Outline. Introduction Avalanche Effect APD vs. SPAD Qenching Circuit Conclusion. Photomutiplier Tube High amplification Slow Fragile Bulky EM field susceptible

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Semiconductor Optical Single-Photon Diode

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  1. Semiconductor Optical Single-Photon Diode Jie Zhang Department of Electrical and Computer Engineering

  2. Outline • Introduction • Avalanche Effect • APD vs. SPAD • Qenching Circuit • Conclusion

  3. Photomutiplier Tube High amplification Slow Fragile Bulky EM field susceptible Relatively expensive Avalanche photodiode Similar amplification Fast Rugged Small Not susceptible Cheap PMT vs. APD

  4. Structure

  5. Avalanche Effect

  6. APD – SPAD comparison APD SPAD BIAS : MODE : GAIN : Below BD linear e-/ph Above BD Geiger infinite AMPLIFIER TRIGGER How to observe faint and fast photon sources with the highest QE?

  7. hν Qenching circuit VA R1 Vout(t) R2

  8. Active Qenching circuit

  9. Compact modules in the 90’s Integrated AQC today Earlier modules in the 80’s

  10. Conclusion • APDs operated at geiger mode together with a quenching circuit can be used as single photon detectors particular in the red and near IR spectral range. • This photon counting techniques provide the ultimate sensitivity and accuracy in measurements of weak and/or fast optical signals.

  11. The end…… Thank you!

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