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Related Experiment Video

Updated: Apr 15, 2026

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Ultrasensitive graphene far-infrared power detectors.

C B McKitterick1, D E Prober, H Vora

  • 1Department of Physics, Yale University, New Haven, CT 06520, USA. Department of Applied Physics, Yale University, New Haven, CT 06520, USA.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 4, 2015
PubMed
Summary

Ultrasensitive graphene photon detectors show promise for far-infrared/terahertz applications. Optimized devices could achieve a noise equivalent power (NEP) of 2 × 10⁻¹⁹ W Hz⁻¹/², enabling highly sensitive detection.

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Area of Science:

  • Condensed Matter Physics
  • Optoelectronics
  • Materials Science

Background:

  • Graphene's unique electronic properties make it a candidate for advanced photodetector applications.
  • The far-infrared/terahertz (FIR/THz) spectral region requires highly sensitive detection technologies.
  • Existing detectors often face limitations in sensitivity and operating range.

Purpose of the Study:

  • To theoretically predict and experimentally assess the power detection sensitivity of ultrasensitive graphene photon detectors.
  • To investigate the impact of different superconducting contacting schemes on detector performance.
  • To establish reliable methods for predicting the noise equivalent power (NEP) of graphene-based detectors.

Main Methods:

  • Theoretical modeling of graphene photon detectors with superconducting contacts (insulating barrier and direct).
  • Low-temperature thermal measurements of graphene to analyze electron-phonon cooling.
  • Utilizing Johnson noise emission measurements as a thermometry method for NEP prediction.

Main Results:

  • Theoretical predictions for power detection sensitivity were established for two contacting schemes.
  • Electron-phonon cooling in graphene was quantitatively analyzed at low temperatures.
  • A noise equivalent power (NEP) of 2 × 10⁻¹⁹ W Hz⁻¹/² was predicted for an optimized graphene detector under specific biasing conditions.

Conclusions:

  • Ultrasensitive graphene photon detectors are viable for the FIR/THz spectral region.
  • The understanding of electron-phonon cooling is crucial for optimizing detector sensitivity.
  • Achieving NEP values as low as 2 × 10⁻¹⁹ W Hz⁻¹/² is feasible with optimized graphene devices.