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Updated: Oct 17, 2025

Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects
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Full-visible achromatic imaging with a single dual-pinhole-coded diffractive photon sieve.

Chuan Wang, Ti Sun, Donglin Pu

    Optics Express
    |October 7, 2021
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    Summary

    This study demonstrates achromatic imaging across the full visible spectrum using a single dual-pinhole-coded diffractive photon sieve (PS). This novel optical element overcomes chromatic aberration, enabling broadband imaging with a thin, planar design.

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    Area of Science:

    • Optics and Photonics
    • Optical Engineering
    • Nanotechnology

    Background:

    • Conventional diffractive optical elements exhibit significant chromatic aberration, limiting them to single-wavelength operation.
    • Dispersion in diffractive elements restricts their use to narrow bandwidths, hindering broadband imaging applications.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel diffractive optical element for achromatic imaging across the full visible spectrum.
    • To overcome the limitations of chromatic aberration in diffractive optics for broadband applications.

    Main Methods:

    • Development of a dual-pinhole-coded diffractive photon sieve (PS).
    • Utilizing dual wavelength-multiplexing coding (WMC) and wavefront coding (WFC) to achieve coherent focusing and expand imaging bandwidth.
    • Numerical simulations and experimental fabrication using mask-free UV-lithography.

    Main Results:

    • Achieved broadband achromatic imaging within the full visible range (470-720 nm) using seven selected wavelengths.
    • Experimental results validated numerical simulations, demonstrating the efficacy of the dual-pinhole-coded PS.
    • The fabricated device exhibited a focal length of 500 mm and a diameter of 50 mm.

    Conclusions:

    • The proposed dual-pinhole-coded diffractive photon sieve offers a practical solution for full-visible-range achromatic imaging.
    • This technology enables thin, light, and planar optical systems with broadband imaging capabilities.
    • The work presents a significant advancement in diffractive optics for achieving achromatic performance.