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    This study introduces a novel single-layer achromatic metalens that overcomes chromatic aberration for broadband applications. Its polarization-dependent focal length enables tunable focusing, paving the way for compact imaging devices.

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    Area of Science:

    • Optics and Photonics
    • Metamaterials
    • Nanotechnology

    Background:

    • Traditional varifocal metalenses face limitations in size, tuning complexity, and chromatic aberration, hindering broadband use.
    • Chromatic aberration is a significant challenge in optical systems, leading to reduced image quality and performance across different wavelengths.

    Purpose of the Study:

    • To propose and demonstrate a single-layer achromatic metalens with polarization-dependent focal length.
    • To overcome the limitations of traditional metalenses, particularly chromatic aberration and bulky dimensions.

    Main Methods:

    • Utilizing interference of multi-atomic units with stable intensity superimposition to achieve achromatic focusing.
    • Designing a single-layer metalens structure for polarization-dependent focal length control.

    Main Results:

    • Achieved achromatic focusing over a broad wavelength range (10-11.5 μm).
    • Demonstrated tunable focal length from 0.93 to 1.05 mm with low coefficient variation (<1.75%) by adjusting incident light polarization.

    Conclusions:

    • The proposed single-layer achromatic metalens effectively addresses chromatic aberration.
    • The polarization-tunable focal length offers a new avenue for developing compact and versatile optical imaging systems.