Journal Article light scattering carotenoids cell wall flower petals prism Pigments, Biological Published Erratum Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Review X-ray ptychography arthopods biomaterials biophotonic structures coloration cubic symmetry entomology gyroid-structured materials hierarchical materials luminescence metasurfaces nanomaterials nanotomography optical anisotropy optical metamaterials optically active materials petal striations plant-pollinator signaling polymeric materials