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Summary

This study presents a bifunctional mid-infrared device for sensing applications, enabling both light emission and detection at 8 micrometers. The high-performance device achieves 1 W continuous wave emission, paving the way for integrated photonic sensing platforms.

Keywords:
lab-on-a-chipmonolithic integrated photonicsquantum cascade detectorquantum cascade laser

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Area of Science:

  • Photonics and Optoelectronics
  • Mid-Infrared Technologies
  • Integrated Optics

Background:

  • Bifunctional active regions enable integrated photonics for sensing by performing both light generation and detection at the same wavelength.
  • Mid-infrared (mid-IR) photonics is crucial for various sensing applications.
  • Realizing bifunctional devices at longer wavelengths presents significant challenges in wavelength matching.

Purpose of the Study:

  • To present a high-performance bifunctional device for mid-infrared sensing applications operating at 8 micrometers.
  • To demonstrate the feasibility of bifunctional operation at longer wavelengths with negligible performance loss.
  • To enable sensing techniques requiring continuous wave (CW) operation, such as heterodyne detection, on a monolithic platform.

Main Methods:

  • Development and characterization of a novel bifunctional semiconductor device.
  • Testing of the device's performance in continuous wave (CW) laser emission at 8 micrometers.
  • Evaluation of the device's efficiency and comparison with existing Quantum Cascade Lasers (QCLs).

Main Results:

  • Achieved 1 W single facet CW emission at 15 °C for the bifunctional device operating at 8 micrometers.
  • Demonstrated that bifunctional operation is feasible at longer wavelengths without significant performance degradation.
  • The device exhibits comparable or higher efficiency than state-of-the-art lattice-matched QCLs lacking detection capabilities.

Conclusions:

  • The developed bifunctional device offers a promising solution for integrated mid-infrared photonics and sensing.
  • The device's performance supports the realization of advanced sensing techniques like heterodyne detection on a monolithic platform.
  • This work validates the potential of bifunctional devices for longer wavelength applications, overcoming previous limitations.