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Proceedings Paper

Simulation analysis on the optical role of the number of randomly arranged nano-trees on the Morpho butterfly's scale
Author(s): Akira Saito; Takuto Shibuya; Masaru Yonezawa; Megumi Akai-Kasaya; Yuji Kuwahara
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Paper Abstract

Some of Morpho butterfly species have a mysterious physical coloration. Their blue color has both high reflectivity (>60%) and a single color in too wide angular range (> ± 40° from the normal), which are contradicting with each other from viewpoint of the optical interference. A key to the mechanism of the specific Morpho-color was suggested to be the nano-randomness in arrangement of the nanostructures on its scale, which prevents the rainbow interference. However, concrete optical roles of the nano-randomness remained still unclear. Using finite-difference time-domain (FDTD) analysis, we have recently investigated the optical role of different kinds of randomness in the nanostructure on the Morpho butterfly’s scale. The results revealed clearly several independent roles of different kinds of randomness. On the other hand, by inproving the accuracy of simulation, we have found new aspects on the analysis, especially for the number of random components (nano-trees). These new aspects will give important hint and caution to futher simulation on the optical properties of this specific colorations that have wide potential applications. The direction obtained by the numerical simulations to analyze optically complex random structures will serve not only to understand the scientific principles, but also to design the optical properties of artificial materials.

Paper Details

Date Published: 8 April 2013
PDF: 8 pages
Proc. SPIE 8686, Bioinspiration, Biomimetics, and Bioreplication 2013, 86860J (8 April 2013); doi: 10.1117/12.2012036
Show Author Affiliations
Akira Saito, Osaka Univ. (Japan)
RIKEN Harima Institute (Japan)
Takuto Shibuya, Osaka Univ. (Japan)
Masaru Yonezawa, Osaka Univ. (Japan)
Megumi Akai-Kasaya, Osaka Univ. (Japan)
Yuji Kuwahara, Osaka Univ. (Japan)
RIKEN Harima Institute (Japan)

Published in SPIE Proceedings Vol. 8686:
Bioinspiration, Biomimetics, and Bioreplication 2013
Raúl J. Martín-Palma, Editor(s)

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