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    Researchers developed a tunable diffractive lens using polydimethylsiloxane (PDMS) that offers broadband achromatic performance. This flexible lens enables continuous focal tuning for advanced imaging systems, overcoming a key challenge in diffractive optics.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Imaging Technology

    Background:

    • Diffractive lenses provide weight advantages over refractive lenses, crucial for compact imaging systems.
    • Varifocal diffractive lenses enhance flexibility in applications like microscopy and smartphone cameras.
    • Achieving achromatic performance in varifocal diffractive lenses is a significant technical hurdle.

    Purpose of the Study:

    • To present a novel tunable harmonic diffractive lens with broadband achromatic capabilities.
    • To demonstrate continuous focal length tuning across the visible spectrum using mechanical stretching.
    • To validate the lens's performance for imaging applications.

    Main Methods:

    • Fabrication of a diffractive lens using polydimethylsiloxane (PDMS) with a 23 μm profile and 100 μm substrate.
    • Implementation of a motor-controlled stretching mechanism (1-1.2×) to tune the lens's focal length.
    • Characterization of the lens's focal tuning range and broadband imaging performance under white light.

    Main Results:

    • The tunable harmonic diffractive lens operates across the visible spectrum with broadband performance.
    • Focal length exhibits a proportional scaling with the fourth power of the applied stretch ratio.
    • Continuous focal tuning from 40.4 to 79.5 mm was achieved through controlled stretching.

    Conclusions:

    • The developed PDMS-based tunable harmonic diffractive lens offers a viable solution for achromatic varifocal imaging.
    • Its broadband imaging capability and continuous focal tuning make it suitable for advanced optical systems.
    • This work advances the development of flexible and adaptable diffractive optical elements.