Wafer-scale, subwavelength-structured nipple arrays are directly patterned on silicon using spin-coated silica colloidal monolayers as etching masks. We report a bioinspired templating technique for fabricating broadband antireflection coatings that mimic antireflective moth eyes. Based on the superlattices associated with the observed low-sigma boundaries, it is tentatively suggested that they could lead to diffraction effects for infrared light.īroadband moth-eye antireflection coatings on silicon Such prevalence of low-sigma boundaries suggests that they may serve specific purposes. Surprisingly, the majority of 5-7 defect rows are special low-sigma boundaries that occur infrequently in random crystalline materials. Most often 5-7 defects align in rows to separate nipple domains with different orientations much like grain boundaries in crystalline materials. While the nano- nipples are predominantly in close-packed ordered arrangements, there are coordination defects known as 5-7 defects that disrupt the local translational symmetry and generate a number of secondary defects. This study is concerned with the two-dimensional arrangement of corneal nano- nipples on the eyes of two Nymphalid butterflies. Structural Analysis of Corneal Nano- nipple Arrays in Nymphalidae Butterflies

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