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Related Experiment Video

Updated: Jun 22, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Predictable surface emission patterns in terahertz photonic-crystal quantum cascade lasers.

Y Chassagneux1, R Colombelli, W Maineults

  • 1Institut d'Electronique Fondamentale, Université Paris-Sud and CNRS, UMR8622, Orsay, France. yannick.chassagneux@u-psud.fr

Optics Express
|June 10, 2009
PubMed
Summary

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We developed a framework to predict terahertz (THz) photonic-crystal quantum cascade laser emission. Our model accurately matches experimental results, improving understanding of THz laser performance.

Area of Science:

  • Terahertz (THz) photonics
  • Semiconductor lasers
  • Quantum cascade devices

Background:

  • Quantum cascade lasers (QCLs) are crucial for THz applications.
  • Understanding far-field emission is essential for device optimization.
  • Photonic crystals offer precise control over laser emission properties.

Purpose of the Study:

  • To establish a predictive framework for far-field emission in THz photonic-crystal quantum cascade lasers.
  • To elucidate the underlying physics governing the lasing modes and emission characteristics.
  • To validate theoretical predictions with experimental measurements.

Main Methods:

  • Fabrication of lithographically tunable photonic-crystal quantum cascade lasers.
  • Characterization of laser performance, including output power and operating temperature.

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Last Updated: Jun 22, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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  • Finite-difference time-domain (FDTD) simulations for theoretical far-field pattern prediction.
  • Polarization measurements to support theoretical models.

    • Main Results:

    • Devices emit in the 104–120 µm range with peak output power of 7 mW at 10 K.
    • Maximum operating temperature reached 136 K.
    • Identified lasing modes originate from hexapole and monopole photonic band-edge states.
    • Simulated far-field patterns show excellent agreement with experimental data.

    Conclusions:

    • The developed framework accurately predicts far-field emission in THz photonic-crystal QCLs.
    • The study clarifies the role of specific photonic band structure modes in the lasing process.
    • Experimental and theoretical results confirm the design principles and performance of the THz lasers.