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Two-wavelength achromatic diffractive microlens designed by height optimization method fabricated by two-photon

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    |September 23, 2025
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    Summary

    We developed a faster method to design multiwavelength achromatic diffractive microlenses using an integrated optical path difference and diffraction equation. This 3D nanolithography technique enables efficient fabrication of advanced optical elements.

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    Area of Science:

    • Micro-optics and nanophotonics
    • Diffractive optical elements (DOEs)

    Background:

    • Three-dimensional two-photon nanolithography (3D TPN) fabricates complex microstructures.
    • Multiwavelength achromatic diffractive microlenses are challenging to design.
    • Conventional methods use computationally intensive simulations or complex fabrication.

    Purpose of the Study:

    • To propose a computationally efficient optimization framework for multiwavelength diffractive microlenses.
    • To enable direct height distribution optimization, reducing computational demands.

    Main Methods:

    • Integrated optical path difference and Rayleigh-Sommerfeld diffraction equations.
    • Direct optimization of height distribution for diffractive microlenses.
    • Fabrication using 3D two-photon nanolithography (3D TPN).

    Main Results:

    • Designed and fabricated a dual-wavelength (green and near-infrared) achromatic microlens.
    • Achieved excellent agreement between experimental characterization and theoretical calculations.
    • Demonstrated significantly reduced computational demands compared to FDTD methods.

    Conclusions:

    • The proposed framework offers a computationally efficient strategy for multiwavelength DOE design.
    • 3D TPN is a viable technique for fabricating optimized achromatic microlenses.
    • Potential applications in integrated photonics and bioimaging.