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Transmission optimized LWIR metalens.

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    |January 6, 2023
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    We designed and fabricated high-transmission metalenses for long-wave infrared (LWIR) imaging. These metasurfaces minimize reflection and achieve diffraction-limited performance, advancing infrared optical technologies.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Infrared Technology

    Background:

    • Infrared imaging is crucial in agriculture and defense.
    • Metasurfaces offer compact, high-performance optical functionalities.
    • Existing metalenses face challenges in transmission and wavefront control.

    Purpose of the Study:

    • To design and fabricate high-transmission metalenses for the long-wave infrared (LWIR) spectrum.
    • To achieve full wavefront control with minimized reflection losses.
    • To enable diffraction-limited imaging at a central wavelength of 9.07 µm.

    Main Methods:

    • Utilized metasurface engineering for 2D ultra-thin structures.
    • Incorporated anti-reflection coating (ARC) to minimize reflection losses.
    • Designed unit cells for high average transmission.

    Main Results:

    • Achieved an average transmission of 97.5% for the unit cell structure.
    • Maintained full wavefront control at 9.07 µm.
    • Experimentally verified diffraction-limited imaging performance.

    Conclusions:

    • Successfully designed and fabricated high-transmission LWIR metalenses.
    • Demonstrated the effectiveness of ARC in minimizing reflection losses.
    • Validated the potential of metasurfaces for advanced infrared imaging applications.