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Proceedings Paper

High-throughput reproduction of the Morpho butterfly's specific high contrast blue
Author(s): Akira Saito; Junichi Murase; Masaru Yonezawa; Hiroyuki Watanabe; Takuto Shibuya; Mitsuo Sasaki; Takafumi Ninomiya; Shunji Noguchi; Megumi Akai-kasaya; Yuji Kuwahara
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Paper Abstract

Some species of the blue Morpho butterfly have a mysterious physical feature of strucural color, because it has both high reflectivity (>60%) and a single color in too wide angular range (> ± 40° from the normal), which are contradicting with each other in consideration of the interference phenomena. We have recently proven the principle of the mystery by extracting the physical essence, and emulating the nano-structures using nano-fabrication techniques. The essence was special combination of regular and irregular structures at nanometer scale. Such artificial structural color was found to concern wide applications, because the Morpho-color can produce a single color without pigment in wide angular range with high reflectivity. Also it makes colors impossible by pigment, and is resistant to fading due to chemical change over longtime. However, we must overcome several "death valleys" for wide industrial applications. One of the most serious problems was extremely low throughput in the fabrication process of nano-patterning by the conventional lithography. This difficulty was solved by use of the nano-imprinting technique. However, from the practical viewpoint, the enlargement of the mold area for nano-imprinting process was essential. This problem was found to be solved using the laser fabrication and electroforming processes. Nevertheless, to reproduce the clear blue contrast of the Morpho-color, a blackening treatment at the film interface was found to be necessary. The blackening processes and conditions by use of absorbing layers were then estimated and successfully applied to reproduce the clear contrast of the Morpho-blue, which has been confirmed by the optical measurement of the reflectivity.

Paper Details

Date Published: 4 April 2012
PDF: 10 pages
Proc. SPIE 8339, Bioinspiration, Biomimetics, and Bioreplication 2012, 83390C (4 April 2012); doi: 10.1117/12.915255
Show Author Affiliations
Akira Saito, Osaka Univ. (Japan)
RIKEN Harima Institute (Japan)
Junichi Murase, Osaka Univ. (Japan)
Masaru Yonezawa, Osaka Univ. (Japan)
Hiroyuki Watanabe, Nikkiso Co., Ltd. (Japan)
Ishiwata Co., Ltd. (Japan)
Takuto Shibuya, Osaka Univ. (Japan)
Mitsuo Sasaki, Ishiwata Co., Ltd. (United States)
Takafumi Ninomiya, Canon Machinery Inc. (Japan)
Shunji Noguchi, Canon Machinery Inc. (Japan)
Megumi Akai-kasaya, Osaka Univ. (Japan)
Yuji Kuwahara, Osaka Univ. (Japan)
RIKEN Harima Institute (Japan)

Published in SPIE Proceedings Vol. 8339:
Bioinspiration, Biomimetics, and Bioreplication 2012
Akhlesh Lakhtakia, Editor(s)

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