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Related Experiment Video

Updated: Aug 23, 2025

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Monolithically integrated mid-infrared sensor with a millimeter-scale sensing range.

Qiangqiang Guo, Jinchuan Zhang, Ke Yang

    Optics Express
    |October 27, 2022
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    Summary
    This summary is machine-generated.

    This study presents a compact, integrated on-chip sensor using quantum cascade laser technology for sensitive mid-infrared gas detection. It achieves a significantly improved sensing distance for on-chip spectroscopy applications.

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    Area of Science:

    • Optoelectronics
    • Mid-infrared spectroscopy
    • Quantum cascade laser technology

    Background:

    • Quantum cascade lasers (QCLs) offer compact, high-density integration for on-chip sensing.
    • Microcavity QCLs enable low threshold and small volume devices for optoelectronics.
    • Mid-infrared (MIR) range provides abundant absorption fingerprints for chemical sensing.

    Purpose of the Study:

    • To demonstrate a monolithically integrated on-chip sensor utilizing QCLs.
    • To enhance optical absorption path length and light-matter interactions for improved sensing.
    • To achieve long-range and high-sensitivity on-chip gas sensing and spectroscopy.

    Main Methods:

    • Integration of a notched elliptical resonator (transmitter) and a quantum cascade detector (receiver).
    • Utilizing a surface plasmon structure as a light-sensing waveguide.
    • Exploiting unidirectional lasing properties and evanescent coupling for enhanced light-matter interaction.

    Main Results:

    • Demonstration of a monolithically integrated on-chip sensor.
    • Achieved a sensing transmission distance of approximately 1.16 mm.
    • Obtained an order of magnitude improvement in sensing distance compared to traditional Fabry-Perot waveguides.

    Conclusions:

    • The developed sensor enables long-range and high-sensitivity on-chip gas sensing.
    • This technology opens new avenues for integrated optical spectroscopy.
    • The device design enhances optical absorption path length and light-matter interactions effectively.