title: Reproducing the hierarchy of disorder for Morpho-inspired, broad-angle color reflection.
abstract: The scales of Morpho butterflies are covered with intricate, hierarchical ridge structures that produce a bright, blue reflection that remains stable across wide viewing angles. This effect has been researched extensively, and much understanding has been achieved using modeling that has focused on the positional disorder among the identical, multilayered ridges as the critical factor for producing angular independent color. Realizing such positional disorder of identical nanostructures is difficult, which in turn has limited experimental verification of different physical mechanisms that have been proposed. In this paper, we suggest an alternative model of inter-structural disorder that can achieve the same broad-angle color reflection, and is applicable to wafer-scale fabrication using conventional thin film technologies. Fabrication of a thin film that produces pure, stable blue across a viewing angle of more than 120 ° is demonstrated, together with a robust, conformal color coating.
authors.affiliation: Department of Physics, KAIST, 335 Gwahangno, Yuseong-Gu, Daejeon, Rep. of Korea.
authors.forename: Bokwang
authors.initials: B
authors.lastname: Song
authors.affiliation: Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, United Kingdom.|Department of Mechanical Engineering, Solid Mechanics, Technical University of Denmark, Bld. 404, DK-2800 Kgs. Lyngby, Denmark.
authors.forename: Villads Egede
authors.initials: VE
authors.lastname: Johansen
authors.affiliation: Department of Mechanical Engineering, Solid Mechanics, Technical University of Denmark, Bld. 404, DK-2800 Kgs. Lyngby, Denmark.
authors.forename: Ole
authors.initials: O
authors.lastname: Sigmund
authors.affiliation: Department of Physics, KAIST, 335 Gwahangno, Yuseong-Gu, Daejeon, Rep. of Korea.|Graduate School of Nanoscience and Technology KAIST, 335 Gwahangno, Yuseong-Gu, Daejeon, Rep. of Korea.
authors.forename: Jung H
authors.initials: JH
authors.lastname: Shin
mesh_terms: D000818:Animals; D002080:Butterflies / Q000033:anatomy & histology* / Q000648:ultrastructure; D003116:Color; D021621:Imaging, Three-Dimensional; D010858:Pigmentation; D011108:Polymers / Q000737:chemistry; D014992:Xylenes / Q000737:chemistry
chemical_list: D011108:Polymers; D014992:Xylenes; C011055:parylene