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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Mid-infrared-pumped quantum cascade structure for high-sensitive terahertz detection.

Yan Xie, Ning Yang, Suqing Duan

    Optics Express
    |July 14, 2016
    PubMed
    Summary

    We developed a novel quantum cascade structure for sensitive terahertz (THz) radiation detection. This design utilizes mid-infrared (MIR) pumping and fast phonon extraction for high-speed THz absorption.

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    Area of Science:

    • Optoelectronics
    • Quantum Engineering
    • Terahertz Technology

    Background:

    • Quantum cascade structures are typically used for mid-infrared (MIR) detection.
    • Extending sensitive detection to the terahertz (THz) region presents significant challenges.

    Purpose of the Study:

    • To design a novel pumping-detection quantum cascade structure for THz radiation detection.
    • To enable high-sensitivity and high-speed response for THz absorption.

    Main Methods:

    • Utilized multiple quantum wells to create a pumping-detection structure.
    • Employed mid-infrared (MIR) laser pumping to excite carriers.
    • Incorporated a fast longitudinal optical (LO) phonon extraction mechanism.
    • Designed an absorption well within the LO-phonon extraction stair for THz detection.

    Main Results:

    • Achieved carrier transport between quantum wells in the picosecond range.
    • Demonstrated the potential for high responsivity in THz absorption.
    • Identified doping in the MIR active well and extractor region as crucial for high-speed response.

    Conclusions:

    • The proposed quantum cascade structure effectively enables THz radiation detection.
    • This design extends the high-sensitive detection capabilities of quantum cascade photodetectors from MIR to the THz region.
    • The structure offers a promising platform for advanced THz sensing applications.