Method for modeling additive color effect in photonic polycrystals with form anisotropic elements - the case of Entimus imperialis weevil

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    Résumé

    The calculation of the reflectance of photonic crystals having form-birefringent anisotropic elements in the crystal unit cell, such as cylinders, often turns out to be problematic, especially when the reflectance spectrum has to be computed according to different crystal orientations as in polycrystals for instance. The method we propose here solves this problem in the specific case of photonic crystals whose periodicities are such that there are no diffraction orders except Bragg reflection in the visible range. For a given crystal orientation, the crystal is sliced into layers and the periodic spatial variations of the dielectric function ε are homogenized. Thanks to that homogenization, the calculation can be performed using standard thin film computation codes. In order to demonstrate the usefulness of our method, we applied it to the case of a natural photonic polycrystal found on the cuticle of Entimus imperialis weevil which is a remarkable example of additive color effect. Although each photonic crystal grain of the polycrystal produces a single bright iridescent color, a non-iridescent green matt coloration is perceived by the human eye due to multiscale averaging effects.
    langue originaleAnglais
    Pages (de - à)13228-13240
    Nombre de pages13
    journalOptics Express
    Volume21
    Numéro de publication11
    Date de mise en ligne précoce23 mai 2013
    Les DOIs
    Etat de la publicationPublié - 3 juin 2013

    mots-clés

    • Biomaterials
    • Color
    • Computational electromagnetic methods
    • Optics in computing
    • Photonic bandgap materials
    • Photonic crystals
    • Spectra

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