Alignment of crystal orientations of the multi-domain photonic crystals in Parides sesostris wing scales

Journal of the Royal Society, Interface
S YoshiokaB Matsuhana

Abstract

It is known that the wing scales of the emerald-patched cattleheart butterfly, Parides sesostris, contain gyroid-type photonic crystals, which produce a green structural colour. However, the photonic crystal is not a single crystal that spreads over the entire scale, but it is separated into many small domains with different crystal orientations. As a photonic crystal generally has band gaps at different frequencies depending on the direction of light propagation, it seems mysterious that the scale is observed to be uniformly green under an optical microscope despite the multi-domain structure. In this study, we have carefully investigated the structure of the wing scale and discovered that the crystal orientations of different domains are not perfectly random, but there is a preferred crystal orientation that is aligned along the surface normal of the scale. This finding suggests that there is an additional factor during the developmental process of the microstructure that regulates the crystal orientation.

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Citations

Dec 30, 2014·Journal of the Royal Society, Interface·M R NixonP Vukusic
Sep 16, 2016·Journal of the Royal Society, Interface·Quan XuZhenhai Xia
Oct 7, 2015·Proceedings of the National Academy of Sciences of the United States of America·Benjamin WinterErdmann Spiecker
Apr 7, 2017·Optics Express·Johannes HielscherGerd E Schröder-Turk
Mar 9, 2018·Advanced Materials·Thomas B H SchroederMichael Mayer
Feb 8, 2020·Biomimetics·Sigrid ZoblThorsten Schwerte
Jan 13, 2017·Light, Science & Applications·Benjamin P CummingMin Gu
Nov 11, 2021·Journal of the Royal Society, Interface·Yuka KobayashiShinya Yoshioka

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