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Related Experiment Videos

Efficient single photon detection by quantum dot resonant tunneling diodes.

J C Blakesley1, P See, A J Shields

  • 1Toshiba Research Europe Ltd., 260 Cambridge Science Park, Milton Road, Cambridge CB4 0WE, United Kingdom.

Physical Review Letters
|March 24, 2005
PubMed
Summary

We show that resonant tunnel current in double-barrier structures can detect single photoexcited holes in quantum dots. This enables sensitive single-photon detection with high efficiency and low dark counts.

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Area of Science:

  • Quantum physics
  • Semiconductor devices
  • Photonics

Background:

  • Quantum dots are semiconductor nanocrystals with unique optical and electronic properties.
  • Resonant tunneling through double-barrier structures is a quantum mechanical phenomenon.
  • Single-photon detection is crucial for quantum information processing and sensitive measurements.

Purpose of the Study:

  • To investigate the sensitivity of resonant tunnel current to single photoexcited hole capture in quantum dots.
  • To explore the potential of this phenomenon for single-photon detection.
  • To determine how tunnel barrier thickness affects sensing current and detection performance.

Main Methods:

  • Fabrication of a double-barrier structure adjacent to a layer of quantum dots.

Related Experiment Videos

  • Measurement of resonant tunnel current.
  • Photoexcitation of holes within the quantum dot layer.
  • Analysis of current changes upon hole capture.

    • Main Results:

    • Resonant tunnel current is sensitive to the capture of single photoexcited holes by quantum dots.
    • The sensing current magnitude can be controlled by adjusting tunnel barrier thickness.
    • Demonstrated potential for low dark count rates and high quantum efficiencies in photon detection.

    Conclusions:

    • The demonstrated phenomenon offers a novel approach for sensitive single-photon detection.
    • Tunable tunnel barriers allow optimization of signal-to-noise ratio and sub-microsecond time resolution.
    • This technique holds promise for advancing quantum technologies and sensitive optical measurements.