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Related Experiment Video

Updated: Oct 2, 2025

Microfabrication of Implantable Optics Integrated in a Microstructured Imaging Window for Advanced In Vivo Imaging
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Polychromatic annular folded lenses using freeform gradient-index optics.

David H Lippman, Robert Chou, Ankur X Desai

    Applied Optics
    |February 24, 2022
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    Annular folded lenses (AFLs) achieve compact, high-resolution imaging. Introducing gradient-index materials corrects chromatic aberrations, enabling diffraction-limited polychromatic performance in monolithic designs.

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    Area of Science:

    • Optical engineering
    • Lens design

    Background:

    • Annular folded lenses (AFLs) offer compact, high-resolution imaging.
    • Homogeneous media limit AFLs to monochromatic applications due to chromatic aberrations.

    Purpose of the Study:

    • To explore the use of freeform gradient-index (F-GRIN) media in monolithic AFLs.
    • To achieve diffraction-limited polychromatic imaging performance in AFL designs.

    Main Methods:

    • Surveying monochromatic and polychromatic design methodologies.
    • Constraining F-GRIN designs for fabrication feasibility.

    Main Results:

    • F-GRIN media enhance monochromatic performance in monolithic AFLs.
    • Gradient-index materials enable color correction for polychromatic imaging.

    Conclusions:

    • Monolithic AFLs with F-GRIN media can overcome chromatic aberration limitations.
    • This approach facilitates high-performance, compact, polychromatic imaging systems.