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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Standard achromatic lenses often involve complex multi-element designs.
    • Achieving achromatic correction in micro-optics presents significant challenges.

    Purpose of the Study:

    • To develop achromatic gradient index microlenses using a simplified singlet element.
    • To leverage standard fiber drawing technology for micro-optic fabrication.
    • To demonstrate wavelength-independent focusing in the near-infrared spectrum.

    Main Methods:

    • Utilized internal nanostructurization within a fiber drawing process.
    • Employed simulated annealing and effective medium approximation for lens design.
    • Designed a nanostructured lens with a parabolic refractive index profile.

    Main Results:

    • Fabricated achromatic gradient index microlenses with a singlet element and flat surfaces.
    • Achieved a nearly wavelength-independent focal plane from 600-1550 nm.
    • Demonstrated performance comparable to standard aspheric doublets.

    Conclusions:

    • Standard fiber drawing technology is suitable for fabricating achromatic gradient index microlenses.
    • Nanostructured singlet microlenses offer a simpler alternative to complex achromatic designs.
    • These achromatic microlenses hold promise for advanced micro-imaging and optical fiber coupling.