Reproduction of Morpho Butterfly's Color by Dielectric Multilayer Structure

Abstract

218 1 大阪大学大学院工学研究科（〒565 0871 大阪府吹田市山田丘 2 1）  2 理化学研究所・播磨研究所/SPring 8（〒679 5148 兵庫県佐用郡佐用町光都 1 1 1）  3 JST さきがけ（〒102 0075 東京都千代田区三番町 5） Conspicuous metallic blue of Morpho butter‰ies is well known and attract interest because it is a brilliant luster of natural beings. The blue is produced by their proteins, which are almost transparent without pigment. The origin of the coloration with high re‰ectivi-ty (＞～60) is then attributed to an interference eŠect based on a periodic structure. However, the interference contradicts the blue that is maintained in too wide angular range (＞±40°from the normal). This mystery has recently been explained with a speciˆc multilayer, which is aˆne combination of regular and random structures at nanometer scale. We proved this hypothesis successfully by emulating the 3D structures by deposition of multilayerˆlm on a nano-patterned substrate. Such artiˆcial structural color can be applied to various industries, because it makes colors qualitatively impossible by pigment, and resistant to fading due to chemical change over longtime. Also we developed a high throughput nano-patterning process by use of nano-imprinting method, and succeeded in controlling the optical properties both in angular and wavelength distribution.

Fabrication of MEMS mold with inclined micro-multi-fin structure and shape transfer to resin by thermal imprint process

“…[8][9][10][11][12][13][14][15][16][17] There have been many attempts to artificially fabricate similar multi-fin and multi-layer film microstructures to obtain these structural optical properties. [18][19][20][21][22][23][24][25] Photolithography and thin film deposition techniques have been commonly used for the fabrication of the artificial multilayered structures. Additionally, resin imprinting methods using a micro-mold with reversed micro-fin structures have also been reported.…”