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    Area of Science:

    • Biomimetics
    • Optics
    • Materials Science

    Background:

    • Morpho butterfly wings exhibit striking blue iridescence due to ordered, lamellae-structured ridges.
    • This iridescence arises from multilayer interference and grating diffraction, with random ridge offsets broadening reflection peaks for wide-angle viewing.
    • Previous studies lacked controlled methods to replicate these complex structures and confirm individual factor roles.

    Purpose of the Study:

    • To fabricate Morpho-inspired structures with controlled random offsets.
    • To investigate the specific roles of random offsets and diffraction in achieving broad-angle iridescence.
    • To explore alternative structures for wide-angle color reflection.

    Main Methods:

    • Fabrication using a combination of self-assembly, selective etching, and directional deposition.
    • Creation of Morpho-inspired structures with precisely controlled random offsets.
    • Analysis of reflection properties at various viewing angles and incident angles.

    Main Results:

    • Random offsets were found to be necessary but not sufficient for broad-angle reflection.
    • Diffraction was identified as a critical factor for bright, anisotropic broadening of reflection peaks (0.23 sr solid angle).
    • Random macroscopic surface curvature was proposed as a practical alternative, yielding isotropic broad reflection (0.11 sr solid angle at 60° incidence).

    Conclusions:

    • Understanding the interplay of structure and optical phenomena is crucial for biomimetic design.
    • Diffraction plays a significant role in the wide-angle optical properties of Morpho butterfly wings.
    • Engineered surface curvature offers a viable strategy for achieving isotropic broad-angle color reflection.