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Nonlinear upconverted thermal emission through difference frequency generation.

Ruixin Ma, Hengzhe Yan, Zhihao Zhou

    Optics Letters
    |August 15, 2024
    PubMed
    Summary
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    Researchers converted mid- and far-infrared thermal radiation to visible light using nonlinear materials. This breakthrough enables precise temperature measurements for advanced thermal management and sensing applications.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Thermodynamics

    Background:

    • Objects emit thermal radiation primarily in the mid- and far-infrared spectrum at room temperature.
    • Efficient detection and management of thermal radiation are crucial for energy, sensing, and heat transfer applications.
    • Upconversion of infrared thermal radiation to the visible band is challenging but highly desirable for practical applications.

    Purpose of the Study:

    • To demonstrate the upconversion of mid- and far-infrared thermal radiation to the visible band.
    • To utilize nonlinear optical processes for efficient thermal radiation management and sensing.
    • To enable non-contact temperature measurement of thermal spots.

    Main Methods:

    • Utilized second-order nonlinear materials for thermal radiation upconversion.

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  • Employed a difference frequency generation process to shift radiation to the visible band.
  • Implemented random quasi-phase-matching in a nanoparticle system to facilitate broad-spectrum upconversion.

    • Main Results:

    • Successfully demonstrated the upconversion of mid- and far-infrared thermal radiation to the visible band.
    • Achieved broad-spectrum nonlinear upconversion through random quasi-phase-matching in nanoparticles.
    • Showcased the capability for accurate temperature measurement of thermal spots using the upconverted radiation.

    Conclusions:

    • The developed scheme provides a novel method for upconverting thermal radiation.
    • This technique offers a promising pathway for advanced thermal management and sensing technologies.
    • The ability to measure thermal spot temperatures opens new avenues in various scientific and industrial fields.