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    This study presents a hybrid optical system for long-range thermal infrared imaging. The novel design significantly enhances image quality and clarity at extended distances, offering a lighter and more cost-effective solution.

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    Area of Science:

    • Optics and Photonics
    • Infrared Imaging Technology

    Background:

    • Long-range thermal infrared imaging is crucial for surveillance and monitoring.
    • Traditional systems use large, heavy, and expensive refractive lenses with aspheric profiles.
    • Metasurface optics offer weight reduction but suffer from chromatic aberrations in the long-wave infrared (LWIR) band.

    Purpose of the Study:

    • To develop a high-quality, broadband thermal imaging system for long-range applications.
    • To overcome the limitations of existing refractive and metasurface-only optics.
    • To create a lightweight, cost-effective LWIR imaging solution.

    Main Methods:

    • Designed a hybrid optical system combining four refractive lenses and two all-silicon metasurface correctors (meta-correctors).
    • Evaluated system performance against refractive-only systems.
    • Conducted outdoor testing to assess real-world imaging capabilities.

    Main Results:

    • The hybrid system achieved a threefold contrast enhancement at the detector's half-Nyquist frequency compared to refractive-only systems.
    • Demonstrated noticeably sharper images in outdoor testing, with clear human feature recognition at 250 meters.
    • Utilized off-the-shelf refractive elements and avoided germanium, mitigating supply chain risks.

    Conclusions:

    • Hybrid meta-corrector systems offer a viable path to high-quality, broadband LWIR imaging.
    • The developed system enables long-range, lightweight, and cost-effective thermal imaging solutions.
    • This approach addresses key challenges in current long-wave infrared optical design.